Question 1

In a normal distribution, approximately what percentage of scores falls between one standard deviation below the mean and one standard deviation above the mean?

Accepted Answer

A) 16% 
B) 34% 
C) 68% 
D) 95% 
A) 16% 
B) 34% 
C) 68% 
D) 95% C

Question 2

Which measure of variability is most useful? Why?

Accepted Answer

The most useful measure of variability is the standard deviation. This is because it takes into account the spread of all the data points from the mean, giving a more comprehensive understanding of the variability within the dataset. The standard deviation also allows for easy comparison between different datasets, as it is expressed in the same units as the original data. Additionally, the standard deviation is used in many statistical calculations and is a key component in determining the significance of results in hypothesis testing. Overall, the standard deviation provides a more complete and informative measure of variability compared to other measures such as range or interquartile range.

Question 3

Ten out of 50 participants scored between 65 and 75 on a test. What is the relative frequency of the class interval 65-75?

Accepted Answer

A) .20 
B) .10 
C) 10 
D) .50 
A) .20 
B) .10 
C) 10 
D) .50 A

Question 4

Which of the following is not an advantage of Internet surveys?

Accepted Answer

A) Data can be collected more quickly. 
B) Human error in data entry is avoided. 
C) Identifying the characteristics of the sample is easy. 
D) Researchers can reach people who may not be able to respond during business hours. 
A) Data can be collected more quickly. 
B) Human error in data entry is avoided. 
C) Identifying the characteristics of the sample is easy. 
D) Researchers can reach people who may not be able to respond during business hours.

Question 5

A researcher is studying differences in the prevalence of heart disease in two minority groups. This is an example of ________ research.

Accepted Answer

A) longitudinal 
B) epidemiological 
C) quasi-experimental 
D) demographic 
A) longitudinal 
B) epidemiological 
C) quasi-experimental 
D) demographic

Question 6

In a(n)_______ survey design, a single group of participants is questioned more than once.

Accepted Answer

A) cross-sectional 
B) epidemiological 
C) panel 
D) dependent sample 
A) cross-sectional 
B) epidemiological 
C) panel 
D) dependent sample

Question 7

On a histogram, the x-axis represents the

Accepted Answer

A) individual participants. 
B) frequency of each score. 
C) scores on the independent variable. 
D) class intervals. 
A) individual participants. 
B) frequency of each score. 
C) scores on the independent variable. 
D) class intervals.

Question 8

When choosing ways to describe their data, what three criteria should researchers consider?

Accepted Answer

When choosing ways to describe their dat

Question 9

Name and define the three measures of variability.

Accepted Answer

The three measures of variability are ra

Question 10

What is the mode of these scores: 2, 4, 5, 5, 1, 5, 1?

Accepted Answer

A) 1 
B) 5 
C) 7 
D) These data have no mode. 
A) 1 
B) 5 
C) 7 
D) These data have no mode.

Question 11

What is the mean of these scores: 2, 4, 5, 4, 4, 1, 1?

Accepted Answer

A) 3 
B) 4 
C) 7 
D) 21 
A) 3 
B) 4 
C) 7 
D) 21

Question 12

A researcher obtained a sample of adults and interviewed them about their financial concerns. This is an example of a ______ design.

Accepted Answer

A) cross-sectional survey 
B) panel survey 
C) demographic study 
D) successive independent samples survey 
A) cross-sectional survey 
B) panel survey 
C) demographic study 
D) successive independent samples survey

Question 13

IQ scores are normally distributed, with a mean of 100 and a standard deviation of 15. Approximately what percentage of people have IQ scores that fall below 70?

Accepted Answer

A) 2% 
B) 5% 
C) 34% 
D) 64% 
A) 2% 
B) 5% 
C) 34% 
D) 64%

Question 14

What is a z-score? What would a z-score of -1.5 indicate?

Accepted Answer

A z-score, also known as a standard scor

Question 15

Name and define the three measures of central tendency.

Accepted Answer

The three measures of central tendency a

Question 16

How are data typically collected in survey research?

Accepted Answer

A) Observation and questionnaires 
B) Observation and self-report 
C) Questionnaires and interviews 
D) Samples and populations 
A) Observation and questionnaires 
B) Observation and self-report 
C) Questionnaires and interviews 
D) Samples and populations

Question 17

The square root of the variance is the

Accepted Answer

A) the standard deviation. 
B) confidence interval. 
C) class interval. 
D) z-score. 
A) the standard deviation. 
B) confidence interval. 
C) class interval. 
D) z-score.

Question 18

Which of the following is the same as a panel survey design?

Accepted Answer

A) Successive independent samples design 
B) Longitudinal design 
C) Cross-sectional design 
D) Internet survey design 
A) Successive independent samples design 
B) Longitudinal design 
C) Cross-sectional design 
D) Internet survey design

Question 19

A researcher surveyed two groups of Americans about their fears of terrorism-one group in 2005 and the other group in 2015. This is an example of a _______ design.

Accepted Answer

A) cross-sectional survey 
B) panel survey 
C) demographic 
D) successive independent samples survey 
A) cross-sectional survey 
B) panel survey 
C) demographic 
D) successive independent samples survey

Question 20

A frequency polygon is a

Accepted Answer

A) bar graph. 
B) table. 
C) line graph. 
D) histogram. 
A) bar graph. 
B) table. 
C) line graph. 
D) histogram.

In a normal distribution, approximately what percentage of scores falls between one standard deviation below the mean and one standard deviation above the mean?

Which measure of variability is most useful? Why?

Ten out of 50 participants scored between 65 and 75 on a test. What is the relative frequency of the class interval 65-75?

Which of the following is not an advantage of Internet surveys?

A researcher is studying differences in the prevalence of heart disease in two minority groups. This is an example of ________ research.

In a(n)_______ survey design, a single group of participants is questioned more than once.

On a histogram, the x-axis represents the

When choosing ways to describe their data, what three criteria should researchers consider?

Name and define the three measures of variability.

What is the mode of these scores: 2, 4, 5, 5, 1, 5, 1?

What is the mean of these scores: 2, 4, 5, 4, 4, 1, 1?

A researcher obtained a sample of adults and interviewed them about their financial concerns. This is an example of a ______ design.

IQ scores are normally distributed, with a mean of 100 and a standard deviation of 15. Approximately what percentage of people have IQ scores that fall below 70?

What is a z-score? What would a z-score of -1.5 indicate?

Name and define the three measures of central tendency.

How are data typically collected in survey research?

The square root of the variance is the

Which of the following is the same as a panel survey design?

A researcher surveyed two groups of Americans about their fears of terrorism-one group in 2005 and the other group in 2015. This is an example of a _______ design.

A frequency polygon is a

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The Measurement of Behavior

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Exam 6: Descriptive Research

In a normal distribution, approximately what percentage of scores falls between one standard deviation below the mean and one standard deviation above the mean?

Which measure of variability is most useful? Why?

Ten out of 50 participants scored between 65 and 75 on a test. What is the relative frequency of the class interval 65-75?

Which of the following is not an advantage of Internet surveys?

A researcher is studying differences in the prevalence of heart disease in two minority groups. This is an example of ________ research.

In a(n)_______ survey design, a single group of participants is questioned more than once.

On a histogram, the x-axis represents the

When choosing ways to describe their data, what three criteria should researchers consider?

Name and define the three measures of variability.

What is the mode of these scores: 2, 4, 5, 5, 1, 5, 1?

What is the mean of these scores: 2, 4, 5, 4, 4, 1, 1?

A researcher obtained a sample of adults and interviewed them about their financial concerns. This is an example of a ______ design.

IQ scores are normally distributed, with a mean of 100 and a standard deviation of 15. Approximately what percentage of people have IQ scores that fall below 70?

What is a z-score? What would a z-score of -1.5 indicate?

Name and define the three measures of central tendency.

How are data typically collected in survey research?

The square root of the variance is the

Which of the following is the same as a panel survey design?

A researcher surveyed two groups of Americans about their fears of terrorism-one group in 2005 and the other group in 2015. This is an example of a _______ design.

A frequency polygon is a

Research in the Behavioral Sciences

Behavioral Variability and Research

The Measurement of Behavior

Approaches to Psychological Measurement

Selecting Research Participants

Correlational Research

Advanced Correlational Strategies

Basic Issues in Experimental Research

Experimental Design

Analyzing Experimental Data: Basic Concepts

Statistical Analysis

Quasi-Experimental Designs

Single-Case Research

Ethical Issues in Behavioral Research

Scientific Writing

Filters