Question 1

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 2

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 of interest in this study is the average height of all adult pine trees in the national forest, not just the sample of 600 trees selected for measurement and analysis. This is because the goal is to make an inference about the entire population of adult pine trees, not just the sample. Therefore, choice B is the best option.

Question 3

​One source of data used in thisChapter is the GSS.What does this acronym mean?
A)​General Social Survey
B)​General Statistical Survey
C)​Survey of Government Spending
D)Global Science Survey

Accepted Answer

The acronym GSS stands for General Social Survey, a survey conducted in the United States aimed at collecting data on various social trends and attitudes.

Question 4

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, as the researcher wants to estimate the average number of credits earned by these specific students. Option A is too broad, as it includes all FIU students regardless of when they were enrolled. Option B is also too broad, as it includes all college students which is outside the scope of the research question. Option D is the sample, not the population.

Question 5

​One source of data used in thisChapter is the SCF.What does this acronym mean?
A)​Consumer Financial Survey
B)​Survey of Consumer Finances
C)​Survey of Corporate Finances
D)Social Census Facts

Accepted Answer

The acronym SCF stands for Survey of Consumer Finances, which is a comprehensive survey conducted every three years by the Federal Reserve to gather data on the financial situation of American households.

Question 6

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 7

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 to...

Question 8

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 9

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 10

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 11

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 confidence level indicates the proportion of times the estimation procedure will yield correct results if repeated multiple times.

Question 12

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 13

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 14

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...

Question 15

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 sample is being used to estimate the average height of all 63,000 trees in the forest. Thus, option D is the best choice.

Question 16

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 both measures of the probability that a certain result is not due to random chance. However, they are calculated differently and have different interpretations. Confidence levels are typically larger (for example, 95% or 99%) and indicate the range within which a certain population parameter (such as a mean or proportion) is likely to fall. Significance levels are typically smaller (such as 0.05 or 0.01) and indicate the probability of obtaining results that are as extreme as or more extreme than the observed results if the null hypothesis (usually that there is no difference between groups or no association between variables) is true. Therefore, confidence levels and significance levels have different uses and implications in statistical analysis.

Question 17

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 18

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 smaller group or subset of the population that is actually studied. Choice D represents a population because it includes all registered voters in the state of West Virginia, which is the entire group of interest. Choices A, B, and C are all samples, as they represent smaller subsets of a larger population.

Question 19

The process of using sample statistics to draw conclusions about population parameters is called:
A)finding the significance level.
B)calculating descriptive statistics.
C)doing inferential statistics.
D)calculating the confidence level.

Accepted Answer

Inferential statistics is the branch of statistics that deals with the process of using sample statistics to draw conclusions or make inferences about population parameters. It involves testing hypotheses, estimating parameters, and making predictions. Options A, B, and D are not correct because they do not accurately describe the process of using sample statistics to draw conclusions about population parameters.

Question 20

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...

Quiz 1: What Is Statistics

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:

One source of data used in thisChapter is the GSS.What does this acronym mean?

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:

One source of data used in thisChapter is the SCF.What does this acronym mean?

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

The significance level of a statistical inference measures:

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.

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)____________________.

The confidence level of a statistical inference measures:

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:

How do confidence levels compare to significance levels?

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

The process of using sample statistics to draw conclusions about population parameters is called:

Quiz 1: What Is Statistics

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:

​One source of data used in thisChapter is the GSS.What does this acronym mean?

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:

​One source of data used in thisChapter is the SCF.What does this acronym mean?

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

The significance level of a statistical inference measures:

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.

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)____________________.

The confidence level of a statistical inference measures:

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:

How do confidence levels compare to significance levels?

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

The process of using sample statistics to draw conclusions about population parameters is called:

One source of data used in thisChapter is the GSS.What does this acronym mean?

One source of data used in thisChapter is the SCF.What does this acronym mean?