Question 1

The difference between a sample mean and the population mean is called:

Accepted Answer

A) nonresponse error. 
B) selection bias. 
C) sampling error. 
D) nonsampling error. 
A) nonresponse error. 
B) selection bias. 
C) sampling error. 
D) nonsampling error. C

Question 2

Give three important points to consider when designing a questionnaire.

Accepted Answer

Any three of the following are acceptable: 
 a. Keep the questionnaire as short as possible. 
 b. Design the questions to be short, simple, and clearly worded. 
 c. Consider beginning with simple demographic questions to help respondents get started and become comfortable quickly. 
 d. Consider using a combination of dichotomous questions, multiple-choice questions, and open-ended questions. 
 e. Avoid using leading questions. 
 f. When preparing the questions, think about how you intend to tabulate and analyze the responses.

Question 3

List one advantage and one disadvantage of a telephone interview as a method of data collection.

Accepted Answer

Advantage : It is usually less expensive than other methods of data collection. Disadvantages : It is less personal, has a lower expected response rate, and many people will refuse to respond to telephone surveys unless the issue is of interest to them.

Question 4

When every possible sample with the same number of observations is equally likely to be chosen, the result is called a:

Accepted Answer

A) simple random sample. 
B) stratified random sample. 
C) cluster sample. 
D) biased sample. 
A) simple random sample. 
B) stratified random sample. 
C) cluster sample. 
D) biased sample.

Question 5

Which of the following situations lends itself to cluster samples?

Accepted Answer

A) When it is difficult to develop a complete list of the population members. 
B) When the population members are widely dispersed. 
C) When selecting and collecting data from a simple random sample is too costly. 
D) All of these choices are true. 
A) When it is difficult to develop a complete list of the population members. 
B) When the population members are widely dispersed. 
C) When selecting and collecting data from a simple random sample is too costly. 
D) All of these choices are true.

Question 6

Soft Drinks A soft drink manufacturer has been supplying its products in bottles to grocery stores and in cans to small convenience stores. The company is analyzing sales of this product to determine which type of packaging is preferred by customers. {Soft Drink Narrative} Is this study observational or experimental? Explain.

Accepted Answer

The study is observational. Th

Question 7

Sampling error refers to the difference between the sample and the population that exists only because of the observations that happened to be selected for the sample by chance.

Accepted Answer

A) True 
 B)False

Question 8

Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

Accepted Answer

A) An experiment. 
B) A survey. 
C) Direct observation. 
D) None of these choices. 
A) An experiment. 
B) A survey. 
C) Direct observation. 
D) None of these choices.

Question 9

A target population and a sampled population mean the same thing.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following data collection methods is not observational?

Accepted Answer

A) A personal interview. 
B) A telephone interview. 
C) A self-administered questionnaire. 
D) An experiment. 
A) A personal interview. 
B) A telephone interview. 
C) A self-administered questionnaire. 
D) An experiment.

Question 11

When responses are not obtained from some members of the sample, bias is introduced.

Accepted Answer

A) True 
 B)False

Question 12

Selection bias occurs when researchers select biased questions to include on a survey.

Accepted Answer

A) True 
 B)False

Question 13

____________________ error refers to differences between the sample and the population.

Accepted Answer

The answer of ____________________ error refers to differences between the...

Question 14

Nonresponse error occurs when responses are not obtained from some members of the sample.

Accepted Answer

A) True 
 B)False

Question 15

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks {Smoking and Heart Attacks Narrative} Briefly describe how the researcher might design an observational study to investigate the relationship between smoking and heart attacks

Accepted Answer

Randomly sample a group of smokers and r

Question 16

A(n)____________________ sample is obtained by separating the population into groups and taking a simple random sample from each group.

Accepted Answer

The answer of A(n)____________________ sample is obtained by separating the...

Question 17

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks {Smoking and Heart Attacks Narrative} How can you show that smoking causes heart attacks without being able to do a designed experiment?

Accepted Answer

Instead of conducting one simple observa

Question 18

What is meant by a self-selected sample? Why are self-selected samples not desirable?

Accepted Answer

A self-selected sample is a sample forme

Question 19

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

Accepted Answer

A) Stratified random samples. 
B) Self-selected samples. 
C) Cluster samples. 
D) All of these choices are true. 
A) Stratified random samples. 
B) Self-selected samples. 
C) Cluster samples. 
D) All of these choices are true.

Question 20

An experiment involves collecting data about persons or objects by deliberately exposing them to some kind of change and comparing the results.

Accepted Answer

A) True 
 B)False

The difference between a sample mean and the population mean is called:

Give three important points to consider when designing a questionnaire.

List one advantage and one disadvantage of a telephone interview as a method of data collection.

When every possible sample with the same number of observations is equally likely to be chosen, the result is called a:

Which of the following situations lends itself to cluster samples?

Sampling error refers to the difference between the sample and the population that exists only because of the observations that happened to be selected for the sample by chance.

Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

A target population and a sampled population mean the same thing.

Which of the following data collection methods is not observational?

When responses are not obtained from some members of the sample, bias is introduced.

Selection bias occurs when researchers select biased questions to include on a survey.

____________________ error refers to differences between the sample and the population.

Nonresponse error occurs when responses are not obtained from some members of the sample.

A(n)____________________ sample is obtained by separating the population into groups and taking a simple random sample from each group.

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks {Smoking and Heart Attacks Narrative} How can you show that smoking causes heart attacks without being able to do a designed experiment?

What is meant by a self-selected sample? Why are self-selected samples not desirable?

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

An experiment involves collecting data about persons or objects by deliberately exposing them to some kind of change and comparing the results.

What Is Statistics

Graphical and Tabular Descriptive Techniques

Numerical Descriptive Techniques

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populat

Inference About Comparing Two Populat

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlat

Multiple Regression

Review of Statistical Inference

Filters

Exam 4: Data Collection and Sampling

The difference between a sample mean and the population mean is called:

Give three important points to consider when designing a questionnaire.

List one advantage and one disadvantage of a telephone interview as a method of data collection.

When every possible sample with the same number of observations is equally likely to be chosen, the result is called a:

Which of the following situations lends itself to cluster samples?

Sampling error refers to the difference between the sample and the population that exists only because of the observations that happened to be selected for the sample by chance.

Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

A target population and a sampled population mean the same thing.

Which of the following data collection methods is not observational?

When responses are not obtained from some members of the sample, bias is introduced.

Selection bias occurs when researchers select biased questions to include on a survey.

____________________ error refers to differences between the sample and the population.

Nonresponse error occurs when responses are not obtained from some members of the sample.

A(n)____________________ sample is obtained by separating the population into groups and taking a simple random sample from each group.

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks {Smoking and Heart Attacks Narrative} How can you show that smoking causes heart attacks without being able to do a designed experiment?

What is meant by a self-selected sample? Why are self-selected samples not desirable?

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

An experiment involves collecting data about persons or objects by deliberately exposing them to some kind of change and comparing the results.

What Is Statistics

Graphical and Tabular Descriptive Techniques

Numerical Descriptive Techniques

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populat

Inference About Comparing Two Populat

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlat

Multiple Regression

Review of Statistical Inference

Filters