30. Homoscedasticity refers to the: a . central tendency within one of the two distributions b. variability within the two distributions c. number of degrees of freedom d. all of these 31. When both sets of measures are in ordinal form, the appropriate correlational technique should be: a. the Pearson r b. the t test c. the Spearman r d. the coefficient of determination 32. When the underlying distribution of interval scores is violently skewed, the appropriate correlational technique should be; . the Pearson I b. the t test c. the Spearman r d. none of these . For the Pearson r, rejecting Ho with an alpha of . 05, means that : the correlation is not significant b . there is no possibility that Ho should have been accepted the probability is .95 that Ho should have been accepted d. the probability is . 05 that Ho should have been accepted For questions 34 through 36 use the following information. A researcher selects a random sample of college students and measures them on both the number of hours spent watching TV and grade-point average. The results were as follows: Subject Hours of TV (X) GPA (Y) 50 1 . 90 20 2 . 20 19 2 . 40 10 3. 00 7 2.90 15 2. 50 5 3. 50 40 1 . 95 30 2. 00 10 O 3 . 90 34. The correlation between the two variables is generally: a. positive b. negative . zero d. both positive and negative 35. If the correlation between TV viewing and GPA were significant, then the only valid conclusion one can draw from these data is that: a. TV viewing lowers GPA b. TV viewing increases GPA c. TV viewing is independent of GPA d. A knowledge of TV viewing time allows for the prediction of GPA 4