Question 1

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 2

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 3

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 interest that one wants to study or generalize to. In this case, all registered voters in the state of West Virginia represent a population. Option A represents a sample as it only includes 2,000 out of the 600,000 subscribers, option B represents a sample as it only includes the first 15 students, and option C represents a sample as it only includes every fourth student to arrive at the bookstore.

Question 4

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 likelihood that a specific result in a statistical analysis occurred by chance. Confidence levels represent the degree of certainty that a particular interval or range of values contains the true population parameter, while significance levels represent the probability of observing a result as extreme as the one obtained, assuming the null hypothesis is true. Confidence levels are typically larger than significance levels, generally ranging from 90% to 99%, while significance levels are typically smaller, often set at 0.05 or 0.01. Therefore, D is the correct answer.

Question 5

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 6

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 the forest. This sample was used to estimate the average height of all the adult walnut trees in the forest. Therefore, the study is making inferences about the population based on the sample.

Question 7

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

Accepted Answer

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

Question 8

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 9

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 10

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 11

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 12

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 13

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 14

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

Accepted Answer

The significance level of a statistical inference, often denoted as alpha, represents the probability of rejecting the null hypothesis when it is actually true. This means that the probability of making a type I error (concluding that there is a significant difference or effect when there really isn't) is equal to the significance level. Therefore, the significance level measures the proportion of times a conclusion about a population will be wrong in the long run.

Question 15

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 she specifically wants to estimate the average number of credits earned by students at FIU for that specific semester. Option A (all FIU students) and option B (all college students) are too broad and do not specify the time period or group of interest, and option D (the 750 FIU students selected at random) is only a sample and not the population of interest for the study.

Question 16

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 17

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 18

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 in this study is the average height of all the adult pine trees in this forest, as the goal is to determine the overall average height of all 29,000 trees, not just the 600 that were measured and analyzed.

Question 19

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 20

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

Accepted Answer

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

Quiz 1: What Is Statistics

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

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:

The confidence level of a statistical inference measures:

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) ____________________.

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

The significance level of a statistical inference measures:

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

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:

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.

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