Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
A study examining the effectiveness of a 7 Minute Screen tests 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 ex 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 data, SP = 12.
a. Find out a regression equation for predicting the cognitive scores from the 7-Minute Screen scores.
b. What proportion of variance in the cognitive scores is accounted for by the regression equation?
c. Does the regression equation account for a significant portion of the variance in cognitive scores?
Use alpha = .05 to evaluate the F-ratio.