Chapter 10 Mastery Quiz

Question 1

After performing a paired-samples t test as part of a hypothesis test, it is recommended by the APA that researchers also consider:

Answer 1

calculating a confidence interval and a measure of effect size.

Question 2

A paired-samples t test results in the following statistic: t(4) = 2.71. Using this test result, make a decision about a two-tailed hypothesis test at p = 0.05.

Answer 2

Fail to reject the null hypothesis because the test statistic does not exceed the critical cutoff.

Question 3

Psychology students took longer to complete a quiz when music was playing in the background than when there was no background noise: t(19) = –4.01, p < 0.05. What is the sample size in this study?

Answer 3

N = 20

Question 4

A paired-samples t test is also known as a:

Answer 4

dependent-samples t test.

Question 5

The major difference between the paired-samples t test and the single-samples t test is that in the paired-samples t test:

Answer 5

we must create difference scores for every individual.

Question 6

The critical cutoffs for a two-tailed, paired-samples t test with N = 9, at a p level of 0.01 are:

Answer 6

–3.356 and 3.356.

Question 7

Credit card debt for 10 people was compared before a major economic crash (perhaps one like that of 2008) and then after economic recovery, let’s say five years later. Which of the following would be an appropriate null hypothesis for this research?

Answer 7

Credit card debt before the economic crash will be approximately the same as that after the economic recovery.

Question 8

For the paired-samples t test, the comparison distribution:

contains means of difference scores.

Answer 8

contains means of difference scores.

Question 9

Calculate a paired-samples t statistic using the following information: Mdifference = 9.0, s = 7.8, N = 17.

Answer 9

4.76