21. In doing a Pearson r with 10 degrees of freedom, there must have been : a. 10 separate scores b . 22 separate scores 10 pairs of scores d. 12 pairs of scores 22. For a given number of degrees of freedom, when the obtained r is equal to the critical tabled value of r, then: a. Ho is accepted b. Ho is rejected c. Ho is rewritten as Ha d. Ho cannot be evaluated 23. With 5 degrees of freedom, the critical tabled value of the Pearson r is . 75 for an . 05 alpha error. If one were to obtain a Pearson r value of -. 76, then: a. Ho would be accepted b. Ho would be rejected c . the alpha error would be negative d. none of these 24. Any Pearson r which is significant at an alpha of . 01 must also : a. be significant at . 001 b. be significant at . 05 c. be significant at any alpha level d. be positive 25. The Pearson r may only be used when the data form is at least : a. nominal b. ordinal c. interval d. ratio 26. The proportion of the variability in the Y distribution which is accounted for by the variability in the X distribution, is determined by : a. the Spearman r b. the null hypothesis the coefficient of contingency d. the coefficient of determination 27. A Pearson r of . 70 yields a coefficient-of-determination accuracy estimate of: a. 70%% b. 35% c. 49% d . . 05% 28. A Pearson r of value of -. 20: a. can nevr be significant b. must always be significant c. cannot be evaluated d. none of these 29. The Pearson r assumes that : a. the samples are randomly selected b. the association between the variables is linear c. the measures do not depart from normality d. all of these