# Exam 2 Answers.pdf - Exam 2 Answers Sec 22 1 a True b True...

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Unformatted text preview: Exam 2 Answers Sec 22 1 a) True b) True c) True d) False e) True f) True g) True 2 a) \$390 ± \$58 minutes or (\$332, \$448) (use t, not Z) b) increase c) decrease d) .42 ±.057 or (0.363, 0.477) 3 a) Ho: μ≥6 Ha: μ<6, df =24, One population – t test for mean b) Ho: μ1‐μ2≤0 Ha: μ1‐μ2>0, df=22, t‐test independent samples pooled variance c) Ho: p≥.40 Ha: p<.40, df=N/A, One population Z‐test of proportion d) Ho: μd=0 Ha: μd≠0, df=12, t‐test dependent sampling, matched pairs 4 a) μa =11 b) Ho: μ≥14 c) 3 d) 0.81 f) FTR Ho e) decrease g) increase 5 Design: Ho: Mean Hospital stay for children treated with pneumonia has not changed. Ha: Mean Hospital stay for children treated with pneumonia has changed. Ho: μ1=μ2 Ha: μ1≠μ2, α=.05, Reject Ho if pvalue<α Pooled Variance t‐test because Independent Sampling & F‐test comparing two variances pvalue=.497 >.10. Data: FTR Ho (pvalue=.054) Conclusion: d,e valid 6 a) Not Valid ‐ Ha should be complement of Ho b) Not Valid ‐ only population parameters allowed, not sample statistics c) Not Valid ‐ Ho must have equality d) Valid 7 a) Ho: Mean commuting time not more than 1.9 hours Ho: μ ≤ 1.9 Ha: Mean commuting time more than 1.9 hours Ha: μ > 1.9 b) Significance level = .01, Reject Ho it t > 2.650 c) t = 1.60, FTR Ho d) Insufficient data to conclude mean commuting time more than 1.9 hours ...
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