Question 27
2.5 out of 2.5 points
In a(n) ________, one sample is compared to a population for which we only know

the mean during hypothesis testing.

Question 28
2.5 out of 2.5 points
The comparison distribution for an independent-samples t test is a distribution of:

Question 29
2.5 out of 2.5 points
The critical cutoff(s) for a two-tailed, paired-samples t test with 23 participants at
a p level of 0.05 is (are):

Question 30
0 out of 2.5 points
What is the formula for the paired-samples t test?

Question 31
2.5 out of 2.5 points
For the single-sample t test, the confidence interval is centered around the:

Question 32
0 out of 2.5 points
In order to report the exact p value associated with the test statistic (result) for
an independent-samples t test, we need to:

Question 33
2.5 out of 2.5 points
Which of the following statements is true about the assumptions of the
independent-samples t test?

Question 34
2.5 out of 2.5 points
A psychologist is interested in whether working memory is influenced by sleep
loss. The psychologist administers a measure of working memory to a group of
subjects at 8 A.M. on Day One of the study and then again at 8 A.M. on Day Two

of the study, after keeping the subjects awake the entire night. Does sleep loss
affect working memory? What is the statistical analysis we would perform to
answer this question?

Question 35
2.5 out of 2.5 points
Researchers were interested in whether relaxation training decreases the number
of headaches a person experiences. They randomly assigned 20 participants to a
control group or a relaxation training group and noted the change in number of
headaches each group reported from the week before training to the week after
training. The dependent variable in this study is:

Question 36
2.5 out of 2.5 points
The formula for the research hypothesis for a paired-samples t test is:
1

Question 37
2.5 out of 2.5 points
The American Psychological Association encourages research to report the
following for paired-samples t tests:

Question 38
2.5 out of 2.5 points
For an independent-samples t test, there were 8 participants in Group 1 and 11
participants in Group 2. The total degrees of freedom were:

Question 39
2.5 out of 2.5 points
According to the null hypothesis, the mean difference for the comparison
distribution in a paired-samples t test is:

Question 40
2.5 out of 2.5 points
We have learned three t tests, including all of the following except:

samples