Question 1

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

Accepted Answer

The sample statistic refers to the result obtained from the sample, which in this case is the reported unemployment rate of 3.4%.

Question 2

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

Accepted Answer

The answer of Answer the question.
-In a survey of 80...

Question 3

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

Accepted Answer

The raw data of the study refers to the individual responses to the question from each of the 2,500 pilots, not the summarized percentage or statistical measures derived from these responses.

Question 4

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

Accepted Answer

The survey's goal was to determine the percentage of pilots who have flown while sleep deprived, as indicated by the finding that 59% reported doing so.

Question 5

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?

Accepted Answer

The first step in conducting a statistical study is to state the goal of the study precisely to ensure clarity and focus in the research process.

Question 6

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

Accepted Answer

The margin of error means Jesus could have as low as 48% support, which is less than 50%, so Yin Ling still had a chance to win.

Question 7

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

Accepted Answer

The goal of the study, as described, is to determine the percentage of U.S. adults who are unemployed, which is directly indicated by reporting an unemployment rate of 3.4%.

Question 8

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?

Accepted Answer

The range 56% to 68% represents the interval likely to contain the true percentage of the entire population (in this case, the community of 29,000 registered voters) that expected the Republican ticket to win, taking into account the margin of error from the poll.

Question 9

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?

Accepted Answer

The range likely to contain the population parameter is calculated using the percentage (59%) and the margin of error (3 percentage points), resulting in a range from 56% to 62%.

Question 10

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

Accepted Answer

The margin of error of 5% applied to the 68% approval rate in a sample suggests that in the larger population, the approval rate could reasonably be expected to be between 63% (68% - 5%) and 73% (68% + 5%). When applied to a population of 2500, this translates to an interval of 1575 (63% of 2500) to 1825 (73% of 2500) people who approve of the council policies.

Question 11

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?

Accepted Answer

The margin of error is calculated as the range divided by 2. The range is 80% - 70% = 10%, so the margin of error is 10% / 2 = 5%.

Question 12

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

Accepted Answer

The margin of error of 4 percentage points means the observed differences in percentages (21% vs. 27%) may not be statistically significant, so the interest rate change might not have a real effect.

Question 13

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

Accepted Answer

The sample statistic refers to a measure that is calculated from the data collected from a sample. In this case, the 65% of the sample who believe the food was overpriced represents the sample statistic.

Question 14

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?

Accepted Answer

The margin of error is calculated as half the range of the percentage values given. Here, the range is 68% - 56% = 12%. Half of that is 6%, which is the margin of error.

Question 15

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?

Accepted Answer

The range likely to contain the number of voters who expected the Republican ticket to win is calculated using the percentage (64%) and the margin of error (3 percentage points) applied to the total number of registered voters (28,000). Thus, the range is from 61% to 67% of 28,000 voters, which calculates to 17,080 (61% of 28,000) to 18,760 (67% of 28,000).

Question 16

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?

Accepted Answer

The original report's estimate of 15,000 to 17,000 skeptical students out of 24,000 total students corresponds to a percentage range of 62.5% to 70.83%, which is accurately represented by the choice stating "Between 63% and 71% of students at the university are skeptical of statistical studies."

Question 17

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

Accepted Answer

The raw data of the study refers to the individual responses to the question about whether attendees believed the food was overpriced.

Question 18

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

Accepted Answer

The report does not clearly state the specific goal of the study, only the observed changes in behavior at different interest rates.

Question 19

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

Accepted Answer

The significant difference in the results of the two polls suggests that one or both of the samples may not be representative of the entire population, rather than indicating a specific error or an exact percentage of support within a margin of error.

Question 20

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

Accepted Answer

The goal of the study was to determine the percentage of attendees who believed the food is overpriced, as indicated by the survey results and the estimation of the percentage of all attendees who share this belief.

Quiz 1: Speaking of Statistics

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

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

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

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?

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

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

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?