Textbook Homework answers for Chapters 8 and 9 Review Questions

Textbook Homework answers for Chapters 8 and 9 Review Questions

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Brief Answers for Chapters 8 and 9 Review Questions. Answers for even-numbered questions can be found in Appendix D in your text book. Chapter 8 8. a. Since n is small, assumption of normality is required. b. 3.1 c. 4.1 9. 3.32 to 3.42 10. a. $113,638 to $124,672 b. $112,581 to $125,729 c. $110,515 to $127,795 15. 90% confidence: t = 1.669 18.42 to 20.58 95% confidence: t = 1.998 18.21 to 20.79 16. a. t =1.984 margin of error = 1.69 b. 47.31 to 50.69 17. t = 2.010 5.73 to 6.95 25. n = 31.65 use 32 26. n = 17.64 use 18 28. a. 327.43 use n=328 b. 464.83 use n =465 c. 802.93 use n =803 36. a. p-bar = 46/200 = .23 b. .0298 c. .1716 to .2884 37. a. p-bar = 473/1100 = .43 b. 0.0293 c. p-bar (+/-1)0.0293 d. .4007 to .4593 38. a. p-bar =.1790 b. p-bar = .6420 margin of error = 0.0738 confidence interval: (.5682, .7158) c. 353.18 use n = 354 40. margin of error = .0267 p-bar = .86 confidence interval: (.8333,.8867) Chapter 9 (odd exercises)
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Unformatted text preview: 7. 1 . : 8000 : 8000 a H H b. Claiming that > 8000 when the plan does not increase sales. c. Concluding that when the plan really would increase sales. 17. 1 . : 125,500 : 125,500 118000 125500 . 1.58 .1142 30000 40 . .1142 0.05. ' . . 1.96 1.96. 1.58. ' Reject if z a H H b z p value c p value Can t reject the null d is or if z z Can t reject = -= = --=-= < -= -19. 1 . : 125,500 : 125,500 14.68 14.32 . 2.08 .0158 1.45 75 . .0158 0.05. . a H H b z p value c p value Reject the null -= =-=-= < = There does appear to be an increase in the hourly wage. 33. 1 . : 21.6 : 21.6 . 24.1 21.6 2.5 24.1 21.6 . 2.08 . . 1 15 .025 .05 4.8 16 . .025 .05. 0.05, . a H H b gallons c t d f n p value is between and d p value is greater than but less than Since pval Reject the null -=-= = =- =--< =...
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Textbook Homework answers for Chapters 8 and 9 Review Questions

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