12.30 GPA and TV watching For the Georgia Student Survey data file on the book’s website, the correlation between daily time spent watching TV and college GPA is -0.35.

a. Interpret r and r2. Use the interpretation of r2 that

(i) refers to the prediction error and (ii) the percent of variability explained.

b. One student is 2 standard deviations above the mean on time watching TV. (i) Would you expect that student to be above or below the mean on college GPA? Explain

(ii) How many standard deviations would you expect that student to be away from the mean on college GPA? Use your answer to explain “regression toward the mean.”