hwSolutions02

hwSolutions02 - Stat 401G Quiz 2 Homework Solutions For...

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Unformatted text preview: Stat 401G: Quiz 2 Homework Solutions For Wednesday September 14, 2011 Note: On a quiz and test, I will give you the sample mean and standard deviation. For this homework, let JMP calculate these statistics. In my solutions, I will carry the decimals out further than is necessary as you might try getting JMP to give you the actual confidence intervals, hypothesis tests, etc. to compare with the solutions you computed by hand. Problem 1.66 For this problem, index 1 is bulimic and index 2 is normal . Statistic V alue ¯ y 1 17 . 818182 s 1 4 . 915652 n 1 11 ¯ y 2 14 . 142857 s 2 5 . 289425 n 2 14 s p = s ( n 1- 1) · s 2 1 + ( n 2- 1) · s 2 1 n 1 + n 2- 2 = s 10 · (4 . 915652) 2 + 13 · (5 . 289425) 2 23 = 5 . 13026 Part (a) : Construct a 95% confidence interval. ( Estimate ) ± t . 025 · SE ( Estimate ) = (¯ y 1- ¯ y 2 ) ± t . 025 · s p r 1 11 + 1 14 (1) = 3 . 675325 ± 2 . 069 · 5 . 13026 r 1 11 + 1 14 = 3 . 675325 ± 2 . 069 · 2 . 067042 = 3 . 675325 ± 4 . 27671 (- . 60 , 7 .....
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This note was uploaded on 02/06/2012 for the course STAT 401 taught by Professor Shelley during the Spring '08 term at Iowa State.

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hwSolutions02 - Stat 401G Quiz 2 Homework Solutions For...

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