A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment. If all the participants show improved performance of 8 or 9 points after treatment, what should the researcher find?
a. The sample mean difference is near zero.
b. The t statistic is near zero.
c. The variance of the difference scores is near zero.
d. None of the other options is correct.
Question 2In general, if the variance of the difference scores increases, what will happen to the value of the t statistic?
a. It will increase in magnitude (move farther toward the tail of the distribution).
b. It will decrease in magnitude (move toward 0 at the center of the distribution).
c. It will stay the same; the t statistic is not affected by the variance of the difference scores.
d. It may increase or may decrease; there is no consistent relationship between variance and the size of the t statistic.
Question 3A researcher reports t(12) = 2.86, p< .05 for a repeated-measures research study. How many individuals participated in the study?
a. n = 11 c. n = 24
b. n = 13 d. n = 25
Question 4A research report describing the results from a repeated-measures t test states that t(22) = 1.71, p> .05.. From this report, what was the outcome of the hypothesis test?
a. Reject the null hypothesis with a sample of n = 23 participants
b. Fail to reject the null hypothesis with a sample of n = 23 participants
c. Reject the null hypothesis with a sample of n = 22 participants
d. Fail to reject the null hypothesis with a sample of n = 22 participants
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