Question: A study evaluates the relationship between scores from a 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. For a sample of n=9 patients, the scores for the 7 minute screen averaged M=7 with SS=92. The cognitive test scores averaged M=17 with SS=236. For these date SP=127.

1. Find the regression equation for predicting the cognitive scores from the 7 minute screen score.

1. What percentage of variance in the cognitive scores is accounted for by the regression equation?

1. Does the regression equation account for a significant portion of the variance in the cognitive scores? Use a = .05 to evaluate the F ratio.

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