the researchers measured each participant's heart rate. Which statistical test should
the researchers use to analyze their data?
Selected Answer:
single-sample t test
Answers:
single-sample t test
z test
independent-samples t test
dependent-samples t test
Question 16
5 out of 5 points
A psychologist is interested in whether working memory is influenced by sleep loss.
The psychologist administers a measure of working memory to two groups of
subjects. The subjects in one group were kept awake for the entire night and the
subjects in the other group maintained their normal sleep schedules. Which
statistical analysis should be performed to answer the question “Does sleep loss
affect working memory?”
Selected Answer:
independent-samples t test
Answers:

single-sample t test
z test
independent-samples t test
paired-samples t test
Question 17
5 out of 5 points
A study found statistically significant results for a hypothesis tested with an
independent-samples t test. According to Cohen's convention, the author of the
study reported her effect size for the test as medium. According to Cohen's
convention, this convention is:
Selected Answer:
0.5.
Answers:
0.5.
0.2.
0.8.
0.3.
Question 18
0 out of 5 points
When statisticians describe pooling the variances, they mean:
Selected Answer:
taking the average of the two variances, disregarding sample size.
Answers:
adding the standard deviations of the two samples.
adding the variances of the two samples.
taking the average of the two variances, accounting for sample size.
taking the average of the two variances, disregarding sample size.
Question 19
0 out of 5 points
The statement “On average, older adults have the same response time as younger
adults” is an example of:
Selected Answer:
the research hypothesis.
Answers:
effect size.
statistical significance.
the null hypothesis.
the research hypothesis.
Question 20
0 out of 5 points
Mehl (2007) published in the journal Science the results of an extensive study of 396
men and women comparing the number of words uttered per day by each sex.
Which statistical test should Mehl use to analyze the data?
Selected Answer:
dependent-samples t test
Answers:

single-sample t test
z test
independent-samples t test
dependent-samples t test
Question 1
5 out of 5 points
The comparison distribution for an independent-samples t test is a distribution of:
Selected Answer:
differences between means.
Answers:
differences between means.
means.
mean difference scores.
scores.
Question 2
5 out of 5 points
A study found statistically significant results for a hypothesis tested with an
independent-samples t test. The author of the study reported her effect size for the
test as 0.82. According to Cohen's convention, this effect size is considered:
Selected Answer:
large.
Answers:
small.
medium.
large.
very large.
Question 3
0 out of 5 points
Squared standard deviation is equivalent to the:
Selected Answer:
pooled variance.