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ps2_answer - 2. .15 + .68 .08 = .75 3. P(Type B computer) =...

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1 Econ 41 Statistics for Economists Summer 2007 Chunming Yuan Problem Set 2 (Answers) Multiple Choice Summary Table Item Answer Item Answer 1. a 18. c 2. b 19. c 3. d 20. d 4. c 21. a 5. c 22. b 6. d 23. d 7. c 8. b 9. a 10. c 11. b 12. d 13. c 14. d 15. c 16. a 17. d Problem and Essay Solutions 1. a. (i) 150 ÷ 400 = .375 (ii) 220 ÷ 400 = .550 (iii) 60 ÷ 180 = .333 (iv) 130 ÷ 250 = .520 b. The events are not mutually exclusive because they can happen together. c. P(female) = .550, P(female does not work) = .600. Hence, these two events are not independent. d. The complementary event is “work” and its probability is .625
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Unformatted text preview: 2. .15 + .68 .08 = .75 3. P(Type B computer) = 120 200 = .60, so P(Type A computer) = .40 There are 120 Type B computers, and 75 of them do not experience any problems, so 45 of them do. That makes 95 computers that experience problems. Therefore, P(Type A computer experience problems) = 50 95 = .526 .40. So the two events are not independent. 2 4. Let A,B,C denote the events that the plug is type A,B,C respectively, and D the event that the plug is defective. We have...
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ps2_answer - 2. .15 + .68 .08 = .75 3. P(Type B computer) =...

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