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KeyM147finals06

# KeyM147finals06 - better than 30 mpg 32 Expected Number of...

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MATH 147 FINAL EXAM Spring 2006 May 17, 2006 Answer Key Part I True/False 1. T 2. F 3. F 4. T 5 F 6. F 7. T 8. F 9. T 10 T 11. T Part II Fill in the blank 12. 0 13. iii 14. 0.5 15. 0.81 16. 50 2 Part III Multiple Choice 17. D 18. D 19. D 20. C 21. E 22. D 23. B 24. B 25. A 26. B 27. C 28. C 29. E Part IV Problems 30. Null Hypothesis: There are the same number of each color in the box. Alternate Hypothesis: There are not the same number of each color in the box. χ 2 = 8 . 0; df = 3; p - value < 5 % ; Conclusion: Reject Null Hypothesis i.e., The data do not support the hypothesis that ”There are the same number of each color in the box.” 31. Null Hypothesis: His car averages 30 mpg. Alternative Hypothesis: His car averages better than 30 mpg. Use t-test; Degrees of freedom = 15; t = -1.69; p-value is between 5% and 10%; The result is not signiﬁcant; Do Not Reject the Null Hypothesis. In non statistical language, the data do not support the claim that the car averages
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Unformatted text preview: better than 30 mpg. 32. Expected Number of correct answers = 8; SE = 2.53; z = 2.77; Chance = 0.3% ; 33. (a) y-68 10 = ( . 6 ) x-32 6 ; 33.(b) 76 ; 33.(c) New Avg = 76; New SD = 8; z = 0.5; Chance = 30.855% ; 34. (a) 3/10 ; 34.(b) 2/5 ; 34.(c) 3/20 ; 34.(d) 3/10 ; 34.(e) 1/3 ; 34.(f) No ; 35. Sample Average = 23% ; SE = 2.1% ; 90% C.I. : (23% +/- (1.65)(2.1%) or (23% +/- 3.47%) 36 SE ( for control ) = 12 / 50 ; SE ( for treatment ) = 12 / 50 ; SE ( for dierence ) = 2 . 4 z = 1 . 75 p-value = 4 %; Therefore Do not reject Null hypothesis. The data do not support the hypothesis that there is a dierence in the teaching methods. Updated 5/8/2007 1...
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