PSY 555 Homework 18



1.        Please determine the percent variation accounted for by a model including two variables where:


(a). The semipartial correlation for the first variable is .482.


(b). The partial correlation for the second variable is .63.


2.        For each of the following graphs, draw in the points that could change the regression equation to resemble that of the dotted line.  Justify your answer in terms of diagnostics and influence.  The number of points you need to draw in each are given.


(a).      Two points                   (b).      Four points




(c).      Two points                   (d).      One point