Run the following program to create the data set CO_VARY. Compute the correlation between IQ and SCORE and conduct a t-test comparing the two groups on TO and SCORE. Next, test if the slope of IQ...

Run the following program to create the data set CO_VARY. Compute the correlation between IQ and SCORE and conduct a t-test comparing the two groups on TO and SCORE. Next, test if the slope of IQ versus SCORE is homogeneous across groups. Finally, conduct an analysis of covariance, testing if the mean SCORE is different by GROUP after you have adjusted for IQ.