Question 1

The Attorney General of the state of California wanted to study criminal law in Los Angeles last year.He randomly selected 46,000 criminal records from the population of 1.5 million convicts in Los Angeles last year.From this sample, he calculated the proportion of litigations, the average amount of money involved per litigation, and the proportion of litigations resulting in a conviction.These calculations are all examples of doing ____________________ statistics.

Accepted Answer

The answer of The Attorney General of the state of...

Question 2

The owner of a large manufacturing company wishes to develop a new employee health benefits package.He selects 500 employees at random and asks them about their preferences regarding their current health benefits package.The 500 employees selected is a(n) ____________________.

Accepted Answer

The answer of The owner of a large manufacturing company...

Question 3

What name do we give to a descriptive measure of a population?

Accepted Answer

The answer of What name do we give to a...

Question 4

The confidence level of a statistical inference measures:
A) the proportion of times a conclusion about a population will be correct.
B) the proportion of times a conclusion about a population will be wrong.
C) the proportion of times an estimation procedure will be correct.
D) the proportion of times an estimation procedure will be wrong.

Accepted Answer

The answer of The confidence level of a statistical inference...

Question 5

The Surgeon General wanted to study malpractice litigation in Chicago.A sample of 32,000 medical records was selected from all 3.5 million patients who were discharged during the year 2011.Using the information from the sample to make conclusions about malpractice litigation in Chicago is an example of doing ____________________ statistics.

Accepted Answer

The answer of The Surgeon General wanted to study malpractice...

Question 6

The Human Resources Director at Florida Atlantic University wishes to develop an employee benefits package.To get an idea of what components of a benefits package are most important, he selects 350 employees at random and asks them for their opinions.Numerically summarizing the preferences of these 350 employees is an example of doing ____________________ statistics.

Accepted Answer

The answer of The Human Resources Director at Florida Atlantic...

Question 7

The Human Resources Director at Illinois State University wishes to develop an employee pension package.To get an idea of what components of a pension package are most important, he selects 525 employees at random and asks them for their opinions.The group of all employees at ISU is known as the ____________________.

Accepted Answer

The answer of The Human Resources Director at Illinois State...

Question 8

The Human Resources Director of a large hospital wants to determine the percentage of all employees who favor a newly proposed benefits package.He selects 300 employees at random and finds that 85% approve the newly proposed package.The percentage of all employees of this company who favor the newly proposed package is a(n) ____________________.

Accepted Answer

The answer of The Human Resources Director of a large...

Question 9

Briefly describe the difference between a population and a sample and give an example of each.

Accepted Answer

The answer of Briefly describe the difference between a population...

Question 10

A researcher at Florida International University (FIU) wants to estimate the average number of credits earned by students last semester at FIU.She randomly selects 750 students from last semester and finds that they averaged 13.75 credits per student.The population of interest to the researcher is:
A) all FIU students.
B) all college students.
C) all FIU students enrolled last semester.
D) the 750 FIU students selected at random.

Accepted Answer

The population of interest to the researcher is all FIU students enrolled last semester because they are the ones from whom the sample was drawn and the researcher wants to estimate the average number of credits earned by this population. A and B are too broad and include people who are not part of the population of interest. D only includes the sample that was selected, which is not the population of interest.

Question 11

A study is under way to determine the average height of all 29,000 adult pine trees in a certain national forest.The heights of 600 randomly selected adult pine trees are measured and analyzed.The parameter in the study is:
A) the average height of the 600 randomly selected adult pine trees.
B) the average height of all the adult pine trees in this forest.
C) all the adult pine trees in this forest.
D) the 600 adult pine trees selected at random from this forest.

Accepted Answer

The parameter being studied is the average height of all the adult pine trees in the forest, not just the 600 that were randomly selected. The study is attempting to make an inference about the population, not just the sample.

Question 12

Which of the following represents a population, as opposed to a sample?
A) 2,000 respondents to a magazine survey which has 600,000 subscribers.
B) The first 15 students in your class completing a final exam.
C) Every fourth student to arrive at the book store on your campus.
D) All registered voters in the state of West Virginia

Accepted Answer

A population refers to the entire group of individuals or objects that we want to study, while a sample is a subset of that population. Option D represents a population, as it includes all registered voters in the state of West Virginia. Option A is a sample, as it includes only 2,000 respondents out of 600,000 subscribers. Option B is also a sample, as it includes only the first 15 students in a class. Option C is a sample, as it includes only every fourth student to arrive at a bookstore on a campus.

Question 13

Each of the following is a form of doing ____________________ statistics: 1) presenting your data using a graph; 2) calculating the mean of your sample; and 3) organizing your data into a table.

Accepted Answer

The answer of Each of the following is a form...

Question 14

At Cedar Rapids Community College, administrators want to determine the average commuting distance for their students who commute to school.They randomly select 250 students who commute and ask them the distance of their commute to campus.From this group a mean of 19.3 miles is computed.
a.
Describe/find the parameter.
b.
Describe/find the statistic.
c.
Describe the population.
d.
Describe the sample.

Accepted Answer

The answer of At Cedar Rapids Community College, administrators want...

Question 15

How do confidence levels compare to significance levels?
A) Confidence levels and significance levels are both typically small.
B) Confidence levels and significance levels are both typically large.
C) Confidence levels are typically small and significance levels are typically large.
D) Confidence levels are typically large and significance levels are typically small.

Accepted Answer

Confidence levels and significance levels are inversely proportional. A high confidence level corresponds to a low significance level and vice versa. Therefore, confidence levels are typically large while significance levels are typically small.

Question 16

What name do we give to a descriptive measure of a sample?

Accepted Answer

The answer of What name do we give to a...

Question 17

A study is under way to determine the average height of all 63,000 adult walnut trees in a certain national forest.The heights of 950 randomly selected adult walnut trees are measured and analyzed.The sample in this study is:
A) the average height of the 950 randomly selected adult walnut trees.
B) the average height of all the adult walnut trees in this forest.
C) all the adult walnut trees in this forest.
D) the 950 adult walnut trees selected at random from this forest.

Accepted Answer

The sample in this study is the 950 adult walnut trees selected at random from this forest. This is because the study only measures and analyzes the heights of these 950 trees, and not all the trees in the forest. Therefore, the results of the study can only be used to estimate the average height of the trees in the sample, and not the entire population of adult walnut trees in the forest.

Question 18

Briefly describe the difference between a parameter and a statistic, and give an example of each.

Accepted Answer

The answer of Briefly describe the difference between a parameter...

Question 19

The significance level of a statistical inference measures:
A) the proportion of times a conclusion about a population will be correct.
B) the proportion of times a conclusion about a population will be wrong.
C) the proportion of times an estimation procedure will be correct.
D) the proportion of times an estimation procedure will be wrong.

Accepted Answer

The significance level of a statistical inference measures the proportion of times a conclusion about a population will be wrong. This is also known as the level of error in the inference. It is typically denoted by alpha (α) and is set prior to conducting the hypothesis test. A lower significance level means lower chances of making an error in rejecting or accepting the null hypothesis.

Question 20

The Commissioner of Health in the state of New York wanted to study malpractice litigation in Albany last year.She randomly selected 53,000 medical records from the population of 2.5 million patients in Albany last year.The proportion of malpractice claims filed from the 53,000 patients is an example of a(n) ____________________.

Accepted Answer

The answer of The Commissioner of Health in the state...

Quiz 1: What Is Statistics

The owner of a large manufacturing company wishes to develop a new employee health benefits package.He selects 500 employees at random and asks them about their preferences regarding their current health benefits package.The 500 employees selected is a(n) ____________________.

What name do we give to a descriptive measure of a population?

The confidence level of a statistical inference measures:

Briefly describe the difference between a population and a sample and give an example of each.

A researcher at Florida International University (FIU) wants to estimate the average number of credits earned by students last semester at FIU.She randomly selects 750 students from last semester and finds that they averaged 13.75 credits per student.The population of interest to the researcher is:

A study is under way to determine the average height of all 29,000 adult pine trees in a certain national forest.The heights of 600 randomly selected adult pine trees are measured and analyzed.The parameter in the study is:

Which of the following represents a population, as opposed to a sample?

Each of the following is a form of doing ____________________ statistics: 1) presenting your data using a graph; 2) calculating the mean of your sample; and 3) organizing your data into a table.

How do confidence levels compare to significance levels?

What name do we give to a descriptive measure of a sample?

A study is under way to determine the average height of all 63,000 adult walnut trees in a certain national forest.The heights of 950 randomly selected adult walnut trees are measured and analyzed.The sample in this study is:

Briefly describe the difference between a parameter and a statistic, and give an example of each.

The significance level of a statistical inference measures: