The first 10 students who arrived for the Friday lecture filled out a questionnaire on their attitudes toward the instructor. The first 10 who were late for the lecture were spotted, and afterward filled out the same questionnaire. The appropriate design for testing the significance of the difference between the means is
a. related samples t-test. c. one-sample t-test.
b. independent samples t-test. d. z-test.
Question 2
Which of the following is not one of the assumptions of the t-test for independent samples?
a. The populations of raw scores form normal distributions.
b. Their dependent scores measure an interval/ratio variable.
c. There is homogeneity of variance.
d. The standard deviation of at least one of the populations is known.
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