31. A psychologist noted that people have more dif- ficulty sleeping in a bright

ID: 129871 • Letter: 3

Question

31. A psychologist noted that people have more dif- ficulty sleeping in a bright room than in a dark room. She measured whether the intensity of the light could predict the time it took a sample of four participants to fall asleep. The data for this hypothetical study are listed in the following table. Compute an analysis of regression for this hypothetical study and make a decision to retain or reject the null hypothesis. WCST Number of 4.00 Time It Took to Sleep (in minutes) Intensity of Light (in watts) 10 20 40 10 18 30 35

Explanation / Answer

R Square

Adjusted R Square

.922a

.851

.776

11.38

2.29

The given table shows the value of simple regression between the x and the y variable. To run regression the basic assumption is that both the variable should have a significant correlation. However, the correlation value is 0.92 where p>.05 level. Therefore, the hypothesis is rejected.