Question 1

Values such as Cohen's d or r2 (the percentage of variance accounted for)are used to measure ____.

Accepted Answer

A) ​the validity of a hypothesis test 
B) ​the risk of committing a type I error 
C) the size of a treatment effect or the strength of a correlation 
D) ​the level of significance 
A) ​the validity of a hypothesis test 
B) ​the risk of committing a type I error 
C) the size of a treatment effect or the strength of a correlation 
D) ​the level of significance C

Question 2

The median is the most commonly used measure of central tendency.

Accepted Answer

A) True 
 B)False  False

Question 3

By convention,it has been determined that alpha levels should be set no larger than ____.

Accepted Answer

A) ​.50 
B) ​.10 
C) .05 
D) ​.01 
A) ​.50 
B) ​.10 
C) .05 
D) ​.01 C

Question 4

What problem is Cohen's kappa intended to correct?​

Accepted Answer

A) ​Split-half reliability tends to underestimate the true reliability of the full test. 
B) Split-half reliability tends to overestimate the true reliability of the full test. 
C) The simple percentage of agreement tends to underestimate the true level of agreement between two observers. 
D) ​The simple percentage of agreement tends to overestimate the true level of agreement between two observers. 
A) ​Split-half reliability tends to underestimate the true reliability of the full test. 
B) Split-half reliability tends to overestimate the true reliability of the full test. 
C) The simple percentage of agreement tends to underestimate the true level of agreement between two observers. 
D) ​The simple percentage of agreement tends to overestimate the true level of agreement between two observers.

Question 5

Which combination of factors is most likely to result in a significant outcome for a hypothesis test?

Accepted Answer

A) ​a small sample size and a small variance 
B) ​a small sample size and a large variance 
C) a large sample size and a small variance 
D) ​a large sample size and a large variance 
A) ​a small sample size and a small variance 
B) ​a small sample size and a large variance 
C) a large sample size and a small variance 
D) ​a large sample size and a large variance

Question 6

For scores measured on a nominal scale of measurement (for example,job classification),which measure of central tendency is appropriate?

Accepted Answer

A) ​mean 
B) ​median 
C) mode 
D) ​standard deviation 
A) ​mean 
B) ​median 
C) mode 
D) ​standard deviation

Question 7

A researcher is interested in the sleeping habits of students at the local state college.The entire set of students enrolled at the college is an example of a ____.

Accepted Answer

A) ​statistic 
B) ​parameter 
C) sample 
D) ​population 
A) ​statistic 
B) ​parameter 
C) sample 
D) ​population

Question 8

A researcher has measured self-esteem for a sample of 40 first-grade children.The researcher would like to divide the children into two equal‑sized groups consisting of the high self-esteem kids and the low self-esteem kids.Which statistical measure will identify the correct score to serve as the boundary between the high and the low self-esteem groups?

Accepted Answer

A) ​the mean 
B) ​the median 
C) the mode 
D) ​the standard deviation 
A) ​the mean 
B) ​the median 
C) the mode 
D) ​the standard deviation

Question 9

It is possible for a distribution of scores to have more than one ____.

Accepted Answer

A) ​mean 
B) ​median 
C) mode 
D) ​range 
A) ​mean 
B) ​median 
C) mode 
D) ​range

Question 10

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?​

Accepted Answer

A) ​0.800 
B) ​0.400 
C) 0.40 
D) ​0.80 
A) ​0.800 
B) ​0.400 
C) 0.40 
D) ​0.80

Question 11

A researcher reports a significant correlation using an alpha level of .01.In this situation,the probability that the researcher is making a ____.

Accepted Answer

A) Type I error is p > .01 B) Type I error is p .01 D) Type II error is p < .01. A) Type I error is p > .01 B) Type I error is p .01 D) Type II error is p < .01.

Question 12

One category of data is obtained by measuring one variable for each individual in a single group of participants.What statistics are most commonly used for data in this category?

Accepted Answer

A) ​descriptive statistics 
B) ​t tests or analysis of variance 
C) correlations or chi-square tests 
D) ​analysis of variance or chi-square tests 
A) ​descriptive statistics 
B) ​t tests or analysis of variance 
C) correlations or chi-square tests 
D) ​analysis of variance or chi-square tests

Question 13

The goal of descriptive statistics is to simplify,summarize,and organize data.​

Accepted Answer

A) True 
 B)False

Question 14

Under what circumstances is a very small treatment effect still likely to be statistically significant?

Accepted Answer

A) ​if the sample size is small and the sample variance is small 
B) ​if the sample size is small and the sample variance is large 
C) if the sample size is large and the sample variance is small 
D) ​if the sample size is large and the sample variance is large 
A) ​if the sample size is small and the sample variance is small 
B) ​if the sample size is small and the sample variance is large 
C) if the sample size is large and the sample variance is small 
D) ​if the sample size is large and the sample variance is large

Question 15

Identify the two basic concerns with using a correlation to measure split-half reliability and explain how these concerns are addressed by Spearman-Brown,K-R 20,and Cronbach's alpha.

Accepted Answer

The two basic concerns with using a corr

Question 16

It is always possible that patterns observed in sample data do not accurately represent patterns in the population.​

Accepted Answer

A) True 
 B)False

Question 17

Which general category of statistical methods is intended to answer questions about populations by using sample data?

Accepted Answer

A) ​parameters 
B) ​statistics 
C) descriptive statistics 
D) ​inferential statistics 
A) ​parameters 
B) ​statistics 
C) descriptive statistics 
D) ​inferential statistics

Question 18

The concept of degrees of freedom is associated with the ____.

Accepted Answer

A) ​mean for a sample 
B) ​mean for a population 
C) variance for a sample 
D) ​variance for a population 
A) ​mean for a sample 
B) ​mean for a population 
C) variance for a sample 
D) ​variance for a population

Question 19

If the data in a scatter plot form a nearly perfect circle,the Pearson correlation would be approximately ____.

Accepted Answer

A) ​+0.8 or +0.9 
B) ​-0.8 or -0.9 
C) 1.00 
D) ​zero 
A) ​+0.8 or +0.9 
B) ​-0.8 or -0.9 
C) 1.00 
D) ​zero

Question 20

In general,a sample with large variance is more likely to produce a significant result than a sample with small variance.

Accepted Answer

A) True 
 B)False

Values such as Cohen's d or r2 (the percentage of variance accounted for)are used to measure ____.

The median is the most commonly used measure of central tendency.

By convention,it has been determined that alpha levels should be set no larger than ____.

What problem is Cohen's kappa intended to correct?

Which combination of factors is most likely to result in a significant outcome for a hypothesis test?

For scores measured on a nominal scale of measurement (for example,job classification),which measure of central tendency is appropriate?

A researcher is interested in the sleeping habits of students at the local state college.The entire set of students enrolled at the college is an example of a ____.

It is possible for a distribution of scores to have more than one ____.

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?

A researcher reports a significant correlation using an alpha level of .01.In this situation,the probability that the researcher is making a ____.

One category of data is obtained by measuring one variable for each individual in a single group of participants.What statistics are most commonly used for data in this category?

The goal of descriptive statistics is to simplify,summarize,and organize data.

Under what circumstances is a very small treatment effect still likely to be statistically significant?

Identify the two basic concerns with using a correlation to measure split-half reliability and explain how these concerns are addressed by Spearman-Brown,K-R 20,and Cronbach's alpha.

It is always possible that patterns observed in sample data do not accurately represent patterns in the population.

Which general category of statistical methods is intended to answer questions about populations by using sample data?

The concept of degrees of freedom is associated with the ____.

If the data in a scatter plot form a nearly perfect circle,the Pearson correlation would be approximately ____.

In general,a sample with large variance is more likely to produce a significant result than a sample with small variance.

Introduction, Acquiring Knowledge, and the Scientific Method.

Research Ideas and Hypotheses.

Defining and Measuring Variables.

Ethics in Research.

Selecting Research Participants.

Research Strategies and Validity.

The Experimental Research Strategy.

Experimental Designs: Between Subjects Design.

Experimental Designs Within Subjects Design.

The Nonexperimental and Quasi-Experimental Strategies: Nonequivalent Group,Pre–Post,and Developmental Designs.

Factorial Designs.

The Correlational Research Strategy.

The Descriptive Research Strategy.

Single-Subject Research Designs.

Writing an APA-Style Research Report.

Filters

Exam 15: Statistical Evaluation of Data.

Values such as Cohen's d or r2 (the percentage of variance accounted for)are used to measure ____.

The median is the most commonly used measure of central tendency.

By convention,it has been determined that alpha levels should be set no larger than ____.

What problem is Cohen's kappa intended to correct?​

Which combination of factors is most likely to result in a significant outcome for a hypothesis test?

For scores measured on a nominal scale of measurement (for example,job classification),which measure of central tendency is appropriate?

A researcher is interested in the sleeping habits of students at the local state college.The entire set of students enrolled at the college is an example of a ____.

It is possible for a distribution of scores to have more than one ____.

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?​

A researcher reports a significant correlation using an alpha level of .01.In this situation,the probability that the researcher is making a ____.

One category of data is obtained by measuring one variable for each individual in a single group of participants.What statistics are most commonly used for data in this category?

The goal of descriptive statistics is to simplify,summarize,and organize data.​

Under what circumstances is a very small treatment effect still likely to be statistically significant?

Identify the two basic concerns with using a correlation to measure split-half reliability and explain how these concerns are addressed by Spearman-Brown,K-R 20,and Cronbach's alpha.

It is always possible that patterns observed in sample data do not accurately represent patterns in the population.​

Which general category of statistical methods is intended to answer questions about populations by using sample data?

The concept of degrees of freedom is associated with the ____.

If the data in a scatter plot form a nearly perfect circle,the Pearson correlation would be approximately ____.

In general,a sample with large variance is more likely to produce a significant result than a sample with small variance.

Introduction, Acquiring Knowledge, and the Scientific Method.

Research Ideas and Hypotheses.

Defining and Measuring Variables.

Ethics in Research.

Selecting Research Participants.

Research Strategies and Validity.

The Experimental Research Strategy.

Experimental Designs: Between Subjects Design.

Experimental Designs Within Subjects Design.

The Nonexperimental and Quasi-Experimental Strategies: Nonequivalent Group,Pre–Post,and Developmental Designs.

Factorial Designs.

The Correlational Research Strategy.

The Descriptive Research Strategy.

Single-Subject Research Designs.

Writing an APA-Style Research Report.

Filters

What problem is Cohen's kappa intended to correct?

A scatter plot shows data points that are widely scattered around a line that slopes down to the right.Which value would be closest to the correlation for these data?

The goal of descriptive statistics is to simplify,summarize,and organize data.

It is always possible that patterns observed in sample data do not accurately represent patterns in the population.