Chapter 10_Solution_1

Chapter 10_Solution_1 - equal variances with samples of n 1...

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QAS129:001 Instructor: Dr. Yudan Zheng I. Multiple choice questions. 1. The t test for the difference between the means of 2 independent populations assumes that the respective a) sample sizes are equal. b) sample variances are equal. c) populations are approximately normal. d) All of the above. ANSWER: c 2. The t test for the mean difference between 2 related populations assumes that the a) population sizes are equal. b) sample variances are equal. c) population of differences is approximately normal or sample sizes are large enough. d) All of the above. ANSWER: c 3. If we are testing for the difference between the means of 2 related populations 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: c 4. If we are testing for the difference between the means of 2 independent populations presumes
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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 = . 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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Chapter 10_Solution_1 - equal variances with samples of n 1...

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