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Assignment 5 - Assignment 5 Due date 25 November 2009 Total...

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Assignment 5 Due date: 25 November 2009 Total number of points: 21 Q 1. (7.11) A study was conducted to determine whether relaxation training, aided by biofeedback and meditation, could help in reducing high blood pressure Subjects were randomly allocated to a biofeedback group or a control group. The biofeedback group received training for eight weeks. The table reports the reduction in systolic blood pressure (mm Hg) after eight weeks. (a) Compute estimated standard error of the difference in mean. (b) Construct a 95% confidence interval for the difference in mean response. (c) Interpret the confidence interval in (a). Biofeedback Control n 1 =69 n 2 =73 ¯ y 1 = 13 . 8 ¯ y 2 = 4 . 0 SE ¯ y 1 = 1 . 34 SE ¯ y 2 = 1 . 30 Q 2. (7.30) In a study of the periodical cicada, researchers measured the hind tibia lengths of the shed skins of 110 individuals. Results for males and females are shown in the table: Male Female n 1 =60 n 2 =50 ¯ y 1 = 78 . 42 ¯ y 2 = 80 . 44 s 1 = 2 . 87 s 2 = 3 . 52 (a) Use t -test to investigate the dependence of tibia length on gender in this species. Use
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