The Pearson correlation between X1 and Y is r = 0.50. When a second variable, X2, is added to the regression equation, we obtain R2 = 0.60. Adding the second variable increases the variability that is predicted by the regression equation for the Y scores by 36 - 25 = 11.
Indicate whether the statement is true or false
Question 2
A researcher is evaluating a treatment that is expected to increase scores. If a one-tailed test with a = .05 is used, then the critical region consists of z-scores greater than 1.65.
Indicate whether the statement is true or false
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