Question: Problem 15 in Chapter 16 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. 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 \(S S=236\). For these data, \(SP=127\)

1. Find the regression equation for predicting the cognitive scores from the 7-Minute screen score.
2. What percentage of variance in the cognitive scores is accounted for by the regression equation?
3. Does the regression equation account for a significant portion of the variance in the cognitive scores? Use \(\alpha=.05\) to evaluate the \(F\) -ratio.

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