Deck 1: Speaking of Statistics

Question 1

Determine whether the given value is a sample statistic or a population parameter.
Based on a sample of 500 patients with high cholesterol, it was found that 67% have heart disease.

A)Population parameter
B)Sample statistic

Answer 1

B

Question 2

Determine whether the given value is a sample statistic or a population parameter.
A sample of 120 employees of a company is selected, and the average age is found to be 37 years.

A)Population parameter
B)Sample statistic

Answer 2

B

Question 3

Determine whether the evaluated group is a population or a sample.
An investigation of 150 randomly selected local restaurants concluded that 42% of local restaurants have serious
Health code violations.

A)Population
B)Sample

Answer 3

B

Question 4

Determine whether the evaluated group is a population or a sample.
Based on a randomly selected group of 500 patients with high cholesterol, it was found that 67% have heart
Disease.

A)Population
B)Sample

Question 5

Determine whether the evaluated group is a population or a sample.
After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found that 45,000 kg of
The meat was spoiled.

A)Population
B)Sample

Question 6

Determine whether the given value is a sample statistic or a population parameter.
A researcher examines the records of all the registered voters in one city and finds that 43% are registered
Democrats.

A)Population parameter
B)Sample statistic

Question 7

Determine whether the evaluated group is a population or a sample.
A professor is trying to determine whether performance on the first exam is related to course drop rate in one of
Her classes. After taking the first exam, 15 of the students dropped the class.

A)Population
B)Sample

Question 8

Determine whether the given value is a sample statistic or a population parameter.
After taking the first exam, 15 of the students dropped the class.

A)Sample statistic
B)Population parameter

Question 9

Determine whether the given value is a sample statistic or a population parameter.
A health and fitness club surveys 40 randomly selected members and finds that the average weight of those
Questioned is 157 lb.

A)Population parameter
B)Sample statistic

Question 10

Determine whether the evaluated group is a population or a sample.
The average age of 45 employees of a large company is found to be 32 years.

A)Population
B)Sample

Question 11

Determine whether the evaluated group is a population or a sample.
A health and fitness club surveys 40 randomly selected members and finds that the average weight of those
Questioned is 157 lb.

A)Population
B)Sample

Question 12

Determine whether the given value is a sample statistic or a population parameter.
A sample of 50 patients is selected from among the patients admitted to the emergency room at a hospital, and
It is found that 28% have no health insurance.

A)Sample statistic
B)Population parameter

Question 13

Determine whether the given value is a sample statistic or a population parameter.
After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found that 45,000 kg of
The meat was spoiled.

A)Sample statistic
B)Population parameter

Question 14

Determine whether the given value is a sample statistic or a population parameter.
A researcher determines that of all 25 year old women in her city, 37% are married.

A)Population parameter
B)Sample statistic

Question 15

Determine whether the given value is a sample statistic or a population parameter.
A researcher determines that 42.7% of all downtown office buildings have ventilation problems.

A)Sample statistic
B)Population parameter

Question 16

Determine whether the evaluated group is a population or a sample.
A researcher examines the records of all the registered voters in one city and finds that 43% are registered
Democrats.

A)Sample
B)Population

Question 17

Determine whether the evaluated group is a population or a sample.
A researcher determines that 42.7% of all downtown office buildings have ventilation problems.

A)Population
B)Sample

Question 18

Determine whether the given value is a sample statistic or a population parameter.
An investigation of 150 randomly selected local restaurants concluded that 42% of local restaurants have serious
Health code violations.

A)Population parameter
B)Sample statistic

Question 19

Determine whether the evaluated group is a population or a sample.
Among 50 of the 302 patients admitted to an emergency room during one month, 28% had no health insurance.

A)Population
B)Sample

Question 20

Determine whether the evaluated group is a population or a sample.
A researcher determines that of all 25 year old women in her city, 37% are married.

A)Population
B)Sample

Question 21

Provide an appropriate response.
Based on a recent survey of adults in 75,000 households, the U.S. Labor Department reported an unemployment
Rate of 3.4%. The margin of error was 0.1 percentage point. The sample statistic for the study is

A)75,000.
B)the margin of error 0.1%.
C)75,000 and 3.4%.
D)3.4%.

Question 22

Answer the question.
In a survey of 80 football players who committed to play in the Division III CCIW conference, 64 said that they
Would work out in their high school weight rooms in the summer before college. The margin of error for the
Survey was 6%. A census of CCIW football players showed that 59% worked out at their high schools. One can
Conclude that

A)the census results are consistent with the confidence interval of the study.
B)there must have been an error in the determination of the margin of error.
C)the sample was less than forthcoming in their responses to the survey.
D)the sample was an unlikely sample.

Question 23

Provide an appropriate response.
In a reputable international survey of 2,500 pilots, it was found that 59% of them said that they have flown a
Plane while sleep deprived. The margin of error was 2.5 percentage points. The raw data of the study is

A)59%
B)the individual responses to the question.
C)2,500 pilots, 2.5 percentage points
D)the total number of pilots currently flying.

Question 24

Provide an appropriate response.
In a reputable international survey of 2,500 pilots, it was found that 59% of them said that they have flown a
Plane while sleep deprived. The margin of error was 2.5 percentage points. The goal of the study was to

A)determine the number of of pilots who have flown while sleep deprived.
B)determine the percentage of pilots who have flown while sleep deprived.
C)determine whether pilots fly while sleep deprived.
D)determine if sleep deprivation affects flight safety.

Question 25

Provide an appropriate response.
A student wanted to know the favorite lunch at a large high school with a closed campus. What is the first step
In conducting a statistical study to answer the question?

A)State the goal of the study precisely.
B)Select a random sample of students.
C)Select a random sample of students and teachers.
D)Select a random sample of teachers.

Question 26

Answer the question.
A poll conducted the day before the student-body presidential election at a 17,000-student midwestern
University showed that 52.5 percent favored Jesus, the rest favoring Yin Ling. The margin of error was 4.5
Percentage points. Since the poll showed that over half favored Jesus, Yin Ling should have

A)expected to win, because Jesus would get 48% of the vote.
B)expected to lose, because she knew Jesus would get between 52.5% and 57%.
C)stayed in the race, because the likely population vote for Jesus is in a range containing less than 50%.
D)conceded the race, because Jesus would get more than 50% of the vote on election day.

Question 27

Provide an appropriate response.
Based on a recent survey of adults in 75,000 households, the U.S. Labor Department reported an unemployment
Rate of 3.4%. The margin of error was 0.1 percentage point. The goal of the study was to

A)predict the unemployment rate for the following decade.
B)determine the percentage of U.S. adults who are unemployed.
C)determine the reasons U.S. adults are unemployed.
D)determine the number of U.S. adults who are unemployed.

Question 28

Answer the question.
Following the Republican National Convention, a poll of 900 voters in a Central Illinois community showed
That 62% expected the Republican ticket to win over the Democrat ticket no matter whom the Democrats chose
For vice-president. The margin of error was 6 percentage points. There are 29,000 registered voters in the
Community. What does the range 56% to 68% represent?

A)The range likely to contain the percent of the population that expected the Republican ticket to win
B)The range of voters nationally who expected the Republican ticket to win
C)The range that contains the percent of the population that expected the Republican ticket to win
D)The range of the 800 persons polled who replied that they expected the Republican ticket to win

Question 29

Answer the question.
Following the Republican National Convention, a poll of 500 voters in a Central Illinois community showed
That 59% expected the Republican ticket to win over the Democrat ticket no matter whom the Democrats chose
For vice-president. The margin of error was 3 percentage points. There are 21,000 registered voters in the
Community. What is the range likely to contain the population parameter?

A)56% to 62%
B)11,760 to 13,020
C)20,500 to 21,500
D)280 to 310

Question 30

Answer the question.
If 68% of the persons in a 100-person sample say that they approve of the actions of the city council with a
Margin of error of 5%, one can conclude that the number of persons in a population of 2500 that approve of
Council policies is

A)1700.
B)probably in the interval 1575 to 1825.
C)probably in the interval 1600 to 1800.
D)250.

Question 31

Answer the question.
In a recent published poll of 200 students at a midwestern university, 150, or 75%, said they would try to
Purchase used textbooks before buying new textbooks. The report stated that somewhere between 70% and 80%
Of the students at the university would first try to purchase used books. What is the margin of error?

A)10%
B)25%
C)75%
D)5%

Question 32

Provide an appropriate response.
A U.S. government report stated that "With bank interest rates at 3.0%, 21% of wage earners believe it
Worthwhile to keep money in a savings account. However, at 5.0% interest, 27% of wage earners believe it
Worthwhile to keep money in a savings account. The margin of error for both studies is 4 percentage points." A
Proper conclusion from the studies is that

A)increasing the interest rate will increase the number of persons saving money in a savings account.
B)the interest rate difference between 3% and 5% may well have no effect on the number of persons saving money in a savings account.
C)increasing the interest rate may well have no effect on the number of persons saving money in a savings account.
D)increasing the interest rate by 2 percentage points will increase the number of persons saving money in a savings account.

Question 33

Provide an appropriate response.
A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that
The food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although
65% of attendees, with a margin of error of 5 percentage points, believe that the food is overpriced, the Taste is a
Popular event. The sample statistic for the study is

A)the 455.
B)the 65% (of the sample).
C)the 65% (of the attendees).
D)the margin of error 5%.

Question 34

Answer the question.
Based on a poll, a newspaper reported that between 56% and 68% of voters would be likely to vote for a school
Bond issue. What is the margin of error of the poll?

A)12%
B)34%
C)6%
D)28%

Question 35

Answer the question.
Following the Republican National Convention, a poll of 900 voters in a Central Illinois community showed
That 64% expected the Republican ticket to win over the Democrat ticket no matter whom the Democrats chose
For vice-president. The margin of error was 3 percentage points. There are 28,000 registered voters in the
Community. What is the range likely to contain the number of voters who expected the Republican ticket to
Win?

A)549 to 603
B)27,424 to 28,576
C)61% to 67%
D)17,080 to 18,760

Question 36

Answer the question.
Of 54 college students interviewed, 36 said they were skeptical of statistical studies. The student conducting the
Study for the campus paper reported that between 15,000 and 17,000 of the 24,000 students on campus were
Skeptical of statistical studies. Which of the following is an acceptable alternative to the original report?

A)"Two of every three students on campus are skeptical of statistic studies."
B)"If you are confident in the results of statistical studies, then the person on your left and the person on your right in every class are skeptical of the results of statistical studies."
C)"Between 63% and 71% of students at the university are skeptical of statistical studies."
D)"A total of 16,000 students on this campus are skeptical of statistical studies."

Question 37

Provide an appropriate response.
A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that
The food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although
65% of attendees, with a margin of error of 5 percentage points, believe that the food is overpriced, the Taste is a
Popular event. The raw data of the study is

A)the margin of error, 5 percentage points.
B)1,250,000 persons, 700 persons, 455 persons.
C)the individual responses to the question.
D)65% of the sample.

Question 38

Provide an appropriate response.
A U.S. government report stated that "With bank interest rates at 3.0%, 21% of wage earners believe it
Worthwhile to keep money in a savings account. However, at 5.0% interest, 27% of wage earners believe it
Worthwhile to keep money in a savings account. The margin of error for both studies is 4 percentage points."
The goal of the study

A)was to determine the effect of interest rates on the percentage of persons saving money.
B)was to prove that higher interest rates encourage more people to save money.
C)is not clear from the report of the study.
D)was to determine the effect of an interest rate increase from 3% to 5% on the percentage of persons saving money.

Question 39

Answer the question.
A poll of 500 citizens of Normal Illinois showed that 61% favored strict enforcement of speed limits with a
Margin of error of 4%. A second poll of 482 citizens of the same town showed that 37% favored strict
Enforcement of speed limits. Based on the results of the two polls, one may conclude that

A)the percent of the population that favors strict enforcement of speed limits is 49% ± 4%.
B)the percent of the population that favors strict enforcement of speed limits is 49% ± 8%.
C)there are definite errors in one of the polls.
D)one or both of the samples may have been unlikely samples from the population.

Question 40

Provide an appropriate response.
A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that
The food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although
65% of attendees, with a margin of error of 5 percentage points, believe that the food is overpriced, the Taste is a
Popular event. The goal of the study was to

A)determine the number of attendees who believe the food is overpriced.
B)determine the percentage of attendees who believed the food is overpriced.
C)determine whether the food is overpriced.
D)determine whether the Taste is popular despite the price.

Question 41

Determine whether a census is practical in the situation described. Explain your reasoning.
You want to determine the mean salary of all biology instructors at the University of Illinois.

A)A census is practical. The number of biology instructors at the University of Illinois is not very large and it would probably be easy to obtain their salaries through a survey that promised anonymity.
B)A census is not practical. The number of biology instructors at the University of Illinois is too large and it would probably be difficult to obtain their salaries because of privacy issues.

Question 42

Provide an appropriate response.
A pollster wanted to determine the immediate reaction of the electorate to the selection of Joe Lieberman as the
Democrat candidate for vice-president. She called 387 random phone numbers and asked the person answering
To respond to the question "I approve of the selection of Joe Lieberman as the Democrat candidate for
Vice-president. Yes or no." What is the weakness of the study?

A)The sample is not representative of the population.
B)The intent of the study is not well-defined.
C)The data collected cannot be transferred to the population.
D)The population of interest is not well-defined.

Question 43

Provide an appropriate response.
You want to determine percentage of licensed motorcyclists who wore a helmet every time they rode their
Motorcycles during the last month. You choose a sample of licensed motorcyclists. You then survey a sample of
Licensed motorcyclists to determine how many of them wore a helmet every time they rode their motorcycles
During the last month. For this sample, you find the percentage of licensed motorcyclists who wore a helmet
Every time they rode their motorcycles during the last month. The next step in the statistical study would be to

A)determine the goal of the study.
B)make an inference about the percentage of licensed motorcyclists who wore a helmet every time they rode their motorcycles during the last month.
C)examine the results of the study for reasonableness.
D)make an inference about the percentage of licensed motorcyclists who wore a helmet occasionally when they rode their motorcycles during the last month.

Question 44

Provide an appropriate response.
As a science project a student wanted to know the average temperature in her state at noon on the first day of
Summer. She called a sample of 30 newspaper offices in the state between 11:30 AM and 12:30 PM on the first
Day of Summer 2000, asking each for the current temperature. What is the weakness of the study?

A)The data collected will not yield sample statistics that represent the desired population parameter because of the time interval.
B)The data collected will not yield sample statistics that represent the desired population parameter, because more densely populated areas may have more newspapers.
C)The sample size is too small.
D)The population is not defined.

Question 45

Determine whether the statement is based on census data or sample data.
Among 50 of the 302 patients admitted to an emergency room during one month, 28% had no health insurance.

A)Census data
B)Sample data

Question 46

Determine whether the statement is based on census data or sample data.
A researcher determines that of all 25 year old women in her city, 37% are married.

A)Census data
B)Sample data

Question 47

Determine whether the statement is based on census data or sample data.
An investigation of 150 randomly selected local restaurants concluded that 42% of local restaurants have serious
Health code violations.

A)Sample data
B)Census data

Question 48

Determine whether the statement is based on census data or sample data.
A researcher examines the records of all the registered voters in one city and finds that 43% are registered
Democrats.

A)Sample data
B)Census data

Question 49

Determine whether the statement is based on census data or sample data.
Based on a randomly selected group of 500 patients with high cholesterol, it was found that 67% have heart
Disease.

A)Census data
B)Sample data

Question 50

Provide an appropriate response.
Data has been collected from a representative sample of a well-defined population to answer the question:
"How much money does the average senior male at Normal Community High School have in his pockets at the
End of the school day on Friday?" The next step in the study is to

A)summarize the data with a sample parameter.
B)determine the margin of error.
C)use the collected data to make inferences about the population.
D)summarize the data with a sample statistic.

Question 51

Determine whether the statement is based on census data or sample data.
A researcher determines that 42.7% of all downtown office buildings have ventilation problems.

A)Sample data
B)Census data

Question 52

Determine whether the statement is based on census data or sample data.
The average age of 45 employees of a large company is found to be 32 years.

A)Sample data
B)Census data

Question 53

Determine whether a census is practical in the situation described. Explain your reasoning.
You want to determine the mean length of all the snakes in Illinois.

A)A census is not practical. The number of snakes in Illinois is much too large.
B)A census is practical. The population is small and it would be simple to measure their lengths.

Question 54

Provide an appropriate response.
Recognizing that overloading a parking garage would lead to unsafe conditions, you want to determine the
Average (mean)weight of vehicles parked in the garage. You choose a sample of vehicles. The next step in the
Statistical study would be to

A)weigh each selected vehicle and then find the mean of these weights.
B)determine the goal of your study.
C)make an inference about the mean weight of all vehicles.
D)determine the population parameter and the margin of error.

Question 55

Provide an appropriate response.
Central Illinois has given a majority of its vote to every Republican presidential candidate since John F.
Kennedy. A study was conducted three weeks after the Democratic convention to determine the preference of
Central Illinois voters. A random sample of 1100 Central Illinoisians was selected from the rolls of registered
Voters. Each was contacted and asked to declare a Bush or Gore preference electronically. The results showed
That 996 of those in the sample showed a preference for Gore. The last step in the statistical study would be to

A)determine the population parameter and the margin of error.
B)publish the results of the study.
C)examine the results for reasonableness.
D)review the study and see if the design was correct to meet the goal of the study.

Question 56

Determine whether the statement is based on census data or sample data.
A health and fitness club surveys 40 randomly selected members and finds that the average weight of those
Questioned is 157 lb.

A)Sample data
B)Census data

Question 57

Determine whether the statement is based on census data or sample data.
After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found that 45,000 kg of
The meat was spoiled.

A)Census data
B)Sample data

Question 58

Determine whether the statement is based on census data or sample data.
After taking the first exam, 15 of the students dropped the class.

A)Sample data
B)Census data

Question 59

Determine whether a census is practical in the situation described. Explain your reasoning.
You want to determine the mean weight of all football players on the local high school football team.

A)A census is practical. The population consists of the small number of players on the local high school team and it is easy to obtain their weights.
B)A census is not practical. It is too difficult to obtain the football players' weights.

Question 60

Determine whether a census is practical in the situation described. Explain your reasoning.
You want to determine the mean cholesterol level of all biology instructors in the United States.

A)A census is practical. The population is small and it would be simple to get them to take a cholesterol test.
B)A census is not practical. The number of biology instructors in the U.S. is large, and it would be extremely difficult to get them all to take a cholesterol test.

Question 61

Select the sample most representative of the population of interest.
A college student who does laundry infrequently wants to determine the effect of blueing on what should be
White clothes.

A)Two loads of wash, one personal, one of a friend, the blueing assigned by a coin flip
B)Reports of two friends, one of whom was given blueing
C)Two loads of personal wash, one with, one without blueing
D)The reports of an internet chatroom on laundry techniques

Question 62

Select the sample most representative of the population of interest.
A concerned parent wants to determine the amount of time spent on the phone by her child's friends.

A)The results of a national poll of 1800 students in the same age group as the child
B)The answers to the question by the parent(s)of 10 of the friends
C)The phone records of 10 of the group of friends
D)The answers to the question by 10 of the friends

Question 63

Select the sample most representative of the population of interest.
A teacher wants to determine the effect of time of bus riding on grades.

A)A sample of 15 records of students who ride the bus and 15 who do not ride the bus
B)The report of GPA and bus riding time of all the students on one bus route
C)The report of GPA and bus riding time of all students at two tables in the school cafeteria
D)A sample of the records of 15 students eligible to ride the bus as determined by distance from school and another sample of 15 students not eligible to ride the bus

Question 64

Answer the question.
An employer wanted to determine the importance of health insurance as a benefit to employees. Which sample
Is least likely to be biased by personal interest?

A)All of the groups have potential bias.
B)A group of 30 employees from the company who had medical treatment in the past year
C)A survey of 300 union members conducted by the union that represents workers at the company
D)A group of thirty potential employees at the state office of employment

Question 65

Answer the question.
A social studies teacher wants to know which news magazine, Time or Newsweek, is the most read by the
Parents of students in his school. Which sample is most likely to evidence personal bias?

A)A group of 30 students reporting on magazines delivered to their homes
B)None of the samples is likely to bias the results by personal interest.
C)A group of 30 students reporting on magazines they see their parent read
D)A group of 30 parents to be contacted by phone

Question 66

Answer the question.
A researcher wants to determine the status of the electorate one month before the presidential election. Select
The sample most likely to produce biased data.

A)A group of 30 persons contacted by phone with the numbers randomly chosen numbers
B)A group of 30 persons on the voter registration list
C)A group of 30 persons from the researcher's church who voted in the last election
D)A random group of 30 persons in the phone book

Question 67

Select the sample most representative of the population of interest.
The Director of Food Operations at a small college campus wants to determine student concerns about cafeteria
Food.

A)A randomly selected group of 30 registered students
B)A randomly selected group of 30 students leaving the dining hall after dinner
C)A randomly selected group of 30 students entering the dining hall before dinner
D)A randomly selected group of 30 students who have signed food contracts

Question 68

Select the sample most representative of the population of interest.
The father of a junior high school student wants to determine the most popular book among junior high
Students.

A)A randomly selected group of 10 booksellers
B)The group of 30 junior high students attending the birthday party of the researcher's child
C)A randomly selected group of 30 junior high students leaving the public library
D)A randomly selected group of 30 junior high students

Question 69

Select the sample most representative of the population of interest.
A researcher wants to determine the relative merits of oak and maple as firewood.

A)Fifteen pieces of each picked up from the floor of a hardwood forest
B)Thirty friends, half of whom burn only oak, half of whom burn only maple
C)Fifteen pieces of each type of wood cut at the same time from branches of the same size
D)Fifteen pieces of each obtained from friends with woodpiles

Question 70

Select the sample most representative of the population of interest.
A researcher wants to determine the status of the electorate one month before the presidential election.

A)A group of 30 persons from church who voted in the last election
B)A group of 30 persons on the voter registration list
C)A group of 30 persons contacted by phone with the numbers randomly chosen numbers
D)A random group of 30 persons in the phone book

Question 71

Select the sample most representative of the population of interest.
A local TV station wanted to report average gasoline prices in the early summer of 2000 in Illinois.

A)Prices reported by 30 gasoline stations uniformly distributed throughout the state
B)Prices reported by the first 30 callers to respond to a request for the last price paid for gasoline
C)Prices reported by the station employees
D)Prices reported by 30 gasoline stations uniformly distributed throughout the viewing area

Question 72

Answer the question.
A local TV station wanted to report average gasoline prices in the early summer of 2000 in Illinois. Which
Sample might evidence bias on the part of the reporter?

A)Prices reported by 30 gasoline stations uniformly distributed throughout the state
B)Prices reported by the first 30 callers to respond to a request for the last price paid for gasoline
C)Prices reported by the station employees
D)Prices reported by 30 gasoline stations uniformly distributed throughout the viewing area

Question 73

Determine whether a census is practical in the situation described. Explain your reasoning.
You want to check the quality of doughnuts before shipping by performing a taste test.

A)A census is practical. The taste tester could wear latex gloves when tasting the doughnuts.
B)A census is not practical. Testing each doughnut by tasting it would leave none intact to sell.

Question 74

Answer the question.
The Director of Food Operations at a small college campus wants to determine student concerns about cafeteria
Food. Select the sample most likely to evidence bias.

A)A randomly selected group of 30 registered students
B)A randomly selected group of 30 students entering the dining hall before dinner
C)A randomly selected group of 30 students leaving the dining hall after a Friday dinner
D)A randomly selected group of 30 students who have signed food contracts

Question 75

Answer the question.
A college student who does laundry infrequently wants to determine the effect of blueing on white clothes.
Which sample is most likely to give biased data?

A)Reports of two friends, one of whom was given blueing
B)Two loads of wash, one personal, one of a friend, the blueing assigned by a coin flip
C)Two loads of personal wash, one with, one without blueing
D)The reports of an internet chatroom on laundry techniques

Question 76

Answer the question.
A researcher wants to determine the relative merits of oak and maple as firewood. Which process is most likely
To bias the results of the study?

A)Comparison of the reports of wood burners on the internet
B)Personal judgement of the fires of 15 pieces of each type of wood picked up from the floor of a hardwood forest
C)Comparisons by 5 friends, none of whom have a wood burning fireplace, of the fires of fifteen pieces of each type of wood obtained from friends with woodpiles
D)The judgments of the quality of a wood fire by 30 friends, half of whom burn only oak, half of whom burn only maple

Question 77

Select the sample most representative of the population of interest.
An employer wanted to determine the importance of health insurance as a benefit to employees.

A)A group of 30 employees from the company who had medical treatment in the past year
B)A group of thirty potential employees at the state office of employment
C)A survey of 300 union members conducted by the union that represents workers at the company
D)A group of thirty employees of the company

Question 78

Select the sample most representative of the population of interest.
A social studies teacher wants to know which news magazine, Time or Newsweek, is the most read by the
Parents of students in his school.

A)A group of 30 students reporting on magazines they see their parents reading
B)The report of a local convenience store on the relative numbers of the two magazines sold
C)A group of 30 parents to be contacted by phone
D)A group of 30 students reporting on magazines delivered to their homes

Question 79

Answer the question.
The father of a junior high school student wants to determine the most popular book among junior high
Students. Select the sample with the least potential bias.

A)A randomly selected group of 30 junior high students
B)A randomly selected group of 30 junior high students leaving the public library
C)The group of 30 junior high students attending the birthday party of the researcher's child
D)A randomly selected group of 10 book sellers

Question 80

Answer the question.
A teacher wants to determine the effect of time of bus riding on grades. Which sample might be affected by the
Personal interest of the reporters?

A)The report of GPA and bus riding time of all students at two tables in the school cafeteria
B)The report of GPA and bus riding time of all the students on one bus route
C)A sample of the records of 15 students eligible to ride the bus as determined by distance from school and another sample of 15 students not eligible to ride the bus
D)A sample of 15 records of students who ride the bus and 15 who do not ride the bus