# PracticeQuestions7AnswersChecked - Practice Questions 7...

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Unformatted text preview: Practice Questions 7 Answers 1. B 2. A 3. A 4. ( 29 ( 29 2 2 2 / 2 0.5 1.96 0.5 32.67 1067.33 0.03 z n ME = = = = ; 5. n =15, / 2 = 0.025. Then df = n -1 =14 and 2 14, 0.975 = 5.629 UCL= ( 29 ( 29 2 2 2 2 2 1, 1 / 2 1 14 46 850.783 2 5.629 n n s s s s --- = = = = . 6. C 7. D 8. A 9. B 10. A 11. a. C b. D 12. a. B b. C c. D d. A 13. a. A b.D c.C d. B 14. a. C b. B c. A 15. a. D b. B 16. B 17. H : =14 vs. 1 H : 14 Test statistic Z= (11.6 - 14) / (3.4 / 3.74) = -2.64 Since p-value = 2 P ( Z < -2.64) 0.0041, we reject H at = 0.01. We conclude that there is sufficient evidence to disprove the claim that the average time to assemble an electronic component is 14 minutes (The population mean appears to be less than 14 minutes.) 18. H : 29 vs. 1 H : < 29 Test statistics t = (26 - 29) / (6.2 / 3.87) = -1.873 Reject H if t < - 1, 14,0.10 n t t - = - = -1.761. Since t = -1.874, we reject H at = 0.10. There is sufficient evidence to prove claim that the product will increase output per machine by 29 units per hour. 19. H : P = 0.80 vs. 1 H : P < 0.80 Test statistics Z = ( 29 / (1 ) / 2.09 p P P P n-- = - Since p-value = P ( Z < -2.09) = 0.0183, we reject H at = 0.025. There is sufficient evidence to doubt the manufacturers claim. 20. H : P = 0.634 vs. 1 H : P < 0.634 Test statistic Z = ( 29 / (1 ) / 1.45 p P P P n-- = - Since p-value = P ( Z < -1.38) = 0.0735, we reject H at = 0.10. There is sufficient evidence to doubt the U.S. Postal Service claim....
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