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e71_hw3_scan - Stats for Strategy Whitten HW 3 Solution...

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Stats for Strategy Whitten HW 3 Solution Directions: So that we get similar answers, use at least four decimal places when rounding intermediate calculations. 6.45 (a) H A : μ < 1250 H 0 : μ 1250 (b) H A : μ > 32 H 0 : μ 32 (c) H A : μ 6 = 5 H 0 : μ = 5 6.46 (a) H A : μ < 18 H 0 : μ 18 (b) H A : μ > 50 H 0 : μ 50 (c) H A : μ 6 = 24 H 0 : μ = 24 7.3 (a) μ = mean monthly rent for all unfurnished, one-bedroom apartments in the community, in $ ¯ x = 531 s = 82.7916 n = 10 = degrees of freedom are df = 9 A 95% confidence interval for μ is ¯ x ± t * s n 531 ± (2 . 262) (82 . 7916) 10 531 ± 59 . 22 = $471.78 to $590.22 1
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4. There is sufficient evidence to show that store sales differ this month compared to last month, on average. (c) No, this conclusion is about the mean change in sales for all stores, not about changes in individual stores. It is even possible for an individual store to suffer decreased sales (a negative change.) 7.7, Part 2
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e71_hw3_scan - Stats for Strategy Whitten HW 3 Solution...

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