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Ch8_selected_Comparison_Two_Populations

Ch8_selected_Comparison_Two_Populations - Chapter 08 The...

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Chapter 08 - The Comparison of Two Populations CHAPTER 8 THE COMPARISON OF TWO POPULATIONS 8.2 H 0 : μ D = 0 H 1 : μ D 0; n = 40 D = 5 D s = 2.3 t t = 13.75. Strongly reject H 0 . 95% C.I. for μ D ± 2.023(2.3/ 40 ) = [4.26, 5.74]. 4 n = 60 D = 0.2 D s = 1; H 0 : μ D 0 H 1 : μ D > 0 t (24) = 1.549. At α = 0.05, we cannot reject H 0 5 n = 15 D = 3.2 D s = 8.436 (D = After – Before) H 0 : μ D 0H 1 : μ D > 0; t t = 1.469. There is no evidence that the shelf facings are effective. 6 n = 12; D = 37.08; D s = 43.99 H 0 : μ D = 0 H 1 : μ D 0. (template: Testing Paired Difference.xls, sheet: Sample Data) Reject H 0 . There is strong evidence that hotels in Spain are cheaper than those in France, based on this small sample. p-value = 0.0139. 8 n = 20 D = 1.25 D s = 42.896 H 0 : μ D = 0 H 1 : μ D 0; t (19) = 0.13. Do not reject H 0 ; no evidence of a difference. 10 H 0 : 2 1 μ μ - = 0 H 1 : 2 1 μ μ - 0; 1 n = 2 n = 30 Nikon (1): 1 x = 8.5; s 1 = 2.1 Minolta (2): 2 x = 7.8; 2 s = 1.8 z = 1.386. Do not reject H 0 . There is no evidence of a difference in the average ratings of the two cameras. 13 Music: 1 n = 128 1 x = 23.5 1 s = 12.2 Verbal: 2 n = 212 2 x = 18.0 2 s = 10.5 H 0 : 2 1 μ μ - = 0H 1 : 2 1 μ μ - 0; z = ) 212 / 5 . 10 ( ) 128 / 2 . 12 ( 0 . 18 5 . 23 2 2 + - = 4.24 Reject H 0 . Music is probably more effective
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