A health psychologist obtained a random sample of 44 individuals at risk for heart disease. From each participant, she obtained measures of daily physical activity (x1), salt intake (x2), weight (x3), and cardiovascular health (y). The sum of squares for y was 200. She submitted these results to a hierarchical regression with x1 and x3 entered on Step 1, then x2 added on Step 2. The sum of squares for the ? values was 60 on Step 1, and 90 on Step 2. Therefore, the change in explained variance (?R2) is ______.
a. .27
b. .15
c. .45
d. .09
Ans: B
Psychology
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