# homework_4_answers - PSC 103B Statistical Analysis of...

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PSC 103B Statistical Analysis of Psychological Data Homework #4 Due: 2/14/2008 1. A research lab recorded the speed with which subjects summoned help for a person in trouble. The subjects were randomly assigned to 3 groups. Group 1 thought that they were the only one listening to the person in trouble (n 1 = 13). Group 2 thought that one other person was also listening (n 2 = 26). Group 3 thought that 4 other people were also listening (n 2 = 13). The dependent variable was the speed with which the subject called for help ( = 1/time x 100). The mean speed scores for the 3 groups were group 1 = .87, group 2 = .72, group 3 = .51. The MS within =.053. (Total: 3 points) a. Reconstruct the analysis of variance summary table; the red squares will remain empty. (1.5 points) Grand mean = .7 SSbetween = 13*(.87-.7) 2 + 26*(.72-.7) 2 + 13*(.51-.7) 2 = .855 b. What is the critical value of the F-statistic at alpha = .05? (0.5 points) F(2,49) ~ F(2,50) = 3.18 c.

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homework_4_answers - PSC 103B Statistical Analysis of...

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