One of the correlation practice problems described a study examining the effectiveness of a 7-Minute Screen test for Alzheimer's disease. The study evaluated the relationship between scores from the 7-Minute Screen and scores for the same patients from a set of cognitive exams that are typically used to test for Alzheimer's disease. Given the calculations you made in the correlation problem:

a. Find the regression equation for predicting the cognitive scores from the 7-Minute Screen score.

b. What percentage of variance in the cognitive scores is accounted for by the regression equation? Note: Simply square the correlation coefficient to get the coefficient of determination (r²) which answers this question.

c. Is the slope of the regression significant? Use = 0.05 to evaluate the F-ratio.