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Studies have suggested that the stress of major life changes is positively related to subsequent physical illness. Holmes and Rahe (1967) devised the Social Readjustment Rating Scale (SRRS) to measure the amount of stressful change in one's life. Each event is assigned a point value, which measures its severity. For example, at the top of the list, death of a spouse is assigned 100 life change units (LCU). Divorce is 73 LCU's, retirement is 45, change of career is 36, the beginning or end of school is 26, and so on. The more life change units one has accumulated in the past year, the more likely he or she is to have an illness. The following hypothetical data show the number of life change units during the past year for a group of people. The data also show the number of doctor visits each person made during the year.
Subject Total LCU's (X) Number of Visits (Y)
A 73 6
B 15 1
C 204 9
D 31 2
E 63 5
F 278 11
G 15 5
H 36 3
I 110 8
J 116 4
K 162 7
Calculate the Pearson Product-Moment Correlation Coefficient, following completely the Handout given. Once you find the regression equation, what would be the predicted number of visits for an LCU score of of 20? For an LCU score of 300?
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