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 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 3

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 4

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 5

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 related, but they are not equivalent. Confidence levels represent the probability that a confidence interval will contain the true population parameter, while significance levels represent the probability of observing a result as extreme or more extreme than the observed result, assuming the null hypothesis is true. Confidence levels are typically larger than significance levels, as they need to capture a larger range of possible parameter values. Therefore, choice D is the best answer.

Question 6

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 7

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 8

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

D represents a complete group of individuals, in this case all registered voters in the state of West Virginia, which is a population. A represents a sample because the 2,000 respondents surveyed represent only a portion of the 600,000 magazine subscribers. B and C also represent samples, as they only include a portion of the total population (students in the class or students arriving at the bookstore).

Question 9

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 10

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 selected for measurement. The goal of the study is to make an inference about the entire population, so the population parameter being estimated is the average height of all 29,000 adult pine trees in the forest.

Question 11

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 consists of the 950 adult walnut trees selected at random from the forest. This sample is being used to estimate the population mean, which is the average height of all 63,000 adult walnut trees in this certain national forest. Therefore, choice D is the best option.

Question 12

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 13

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 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

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 16

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 17

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 18

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 students last semester at FIU. The randomly selected 750 students are just a sample from this population. Option A, all FIU students, is too large a population as it includes students from previous semesters and even graduates, while option B, all college students, is too broad a population as it includes students from all college institutions. Option D, the 750 FIU students selected at random, is just a sample and not the entire population.

Question 19

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...

Quiz 1: What Is Statistics

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

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)____________________.

How do confidence levels compare to significance levels?

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

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.

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

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 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:

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

The significance level of a statistical inference measures:

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

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: