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Unformatted text preview: equal variances with samples of n 1 = 20 and n 2 = 20, the number of degrees of freedom is equal to a) 39. b) 38. c) 19. d) 18. ANSWER: b 5. When testing for the difference between 2 population variances with sample sizes of n 1 = 8 and n 2 = 10, the number of degrees of freedom are a) 8 and 10. b) 7 and 9. c) 18. d) 16. ANSWER: b 6. In testing for differences between the means of two related populations, the null hypothesis is QAS128:001 Instructor: Yudan Zheng a) : 2 D H μ = . b) : D H = . c) : D H < . d) : D H . ANSWER: b 7. In testing for differences between the means of two independent populations, the null hypothesis is: a) 1 2 : H= 2. b) H : 1 – 2 = 0. c) H : 1 – 2 > 0. d) H : 1 – 2 < 2. ANSWER: b 2...
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 Fall '10
 Zheng
 Variance, Null hypothesis, Plus and minus signs, independent populations

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