managerial statistics 8e,Keller,homework solution

managerial statistics 8e,Keller,homework solution -...

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Unformatted text preview: Homework #1 solutions Chapter 13 13.7 Define 1 = the average monthly loss when hiring the guard 2 = the average monthly loss when installing cameras ) ( : 2 1 H = 0 ) ( : 2 1 1 H < 0 Assume 2 1 x x is normally distributed. H0 : ஢ భ మ ஢ మ మ = 1 H1 : ஢ భ మ ஢ మ మ ≠ 1 Two-tail F test: F = 1.02, p-value = 0.4927*2= .9856; Not reject H0 , use equal-variances test statistic F 檢定:兩個常態母體變異數的檢定 Guard Cameras 平均數 361.5 381.8333 變異數 6767.5 6653.367 觀察值個數 6 6 自由度 5 5 F 1.017154 P(F<=f) 單尾 0.492782 臨界值:單尾 5.050329 Rejection region: , t t 372 . 1 t 10 , 10 . 2 1 2 p 2 1 2 1 n 1 n 1 s ) ( ) x x ( t = , 43 . 6 1 6 1 2 6 6 4 . 6653 ) 1 6 ( 5 . 6767 ) 1 6 ( ) 83 . 381 50 . 361 ( p-value = .3382. t 檢定:兩個母體平均數差的檢定,假設變異數相等 Guard Cameras 平均數 361.5 381.8333 變異數 6767.5 6653.367 觀察值個數 6 6 Pooled 變異數 6710.433 假設的均數差...
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managerial statistics 8e,Keller,homework solution -...

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