# Chap011 - Chapter 11 Two-Sample Tests of Hypothesis Chapter...

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Chapter 11 - Two-Sample Tests of Hypothesis Chapter 11 Two-Sample Tests of Hypothesis True / False Questions 1. If the null hypothesis states that there is no difference between the mean income of males and the mean income of females, then the test is one-tailed. True False 2. If the null hypothesis states that there is no difference between the mean net income of retail stores in Chicago and New York City, then the test is two-tailed. True False 3. In testing the difference between two population proportions, we pool the two sample proportions to estimate the population proportion. True False 4. The pooled estimate of the proportion is found by dividing the total number of samples by the total number of successes. True False 5. If we are testing for the difference between two population proportions, it is assumed that the two populations are approximately normal and have equal variances. True False 6. When the standard deviations are equal but unknown, a test for the differences between two population means has n - 1 degrees of freedom. True False 11-1

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Chapter 11 - Two-Sample Tests of Hypothesis 7. If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations, the variances are pooled to compute the best estimated variance. True False 8. If we are testing for the difference between two population means and assume that the two populations have equal and unknown standard deviations, the degrees of freedom are computed as (n 1 )(n 2 ) - 1. True False 9. If two independent samples of size 10 with unequal standard deviations are used to test the difference between the means, the degrees of freedom for a t-statistic are 18. True False 10. When independent samples, with unknown, unequal standard deviations, are used to test for differences in the means, we pool the sample variances. True False 11. A statistics professor wants to compare grades in two different classes of the same course. This is an example of a paired sample. True False 12. If we are testing for the difference between two population means, it is assumed that the sample observations from one population are independent of the sample observations from the other population. True False 13. When dependent samples are used to test for differences in the means, we compute paired differences. True False 11-2
Chapter 11 - Two-Sample Tests of Hypothesis 14. If two dependent samples of size 20 are used to test the difference between the means, the degrees of freedom for a t-statistic are 19. True False 15. When dependent samples are used to test for differences in the means, we pool the sample variances. True False Multiple Choice Questions

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