SME_8e_Ch_13_Section_5 - CHAPTER 13 SECTION 5: INFERENCE...

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1 CHAPTER 13 SECTION 5: INFERENCE ABOUT COMPARING TWO POPULATIONS MULTIPLE CHOICE 129. In constructing a confidence interval estimate for the difference between two population proportions, we: a. pool the population proportions when the populations are normally distributed. b. pool the population proportions when the population means are equal. c. pool the population proportions when they are equal. d. never pool the population proportions. ANS: D PTS: 1 REF: SECTION 13.5 130. For testing the difference between two population proportions, the pooled proportion estimate should be used to compute the value of the test statistic when the: a. populations are normally distributed. b. sample sizes are small. c. samples are independently drawn from the populations. d. null hypothesis states that the two population proportions are equal. ANS: D PTS: 1 REF: SECTION 13.5 131. Which of the following is a required condition for using the normal approximation to the binomial in testing the difference between two population proportions? a. n 1 p 1 30 and n 2 p 2 30 b. n 1 p 1 5, n 1 (1 - p 1 ) 5, n 2 p 2 5, and n 2 (1 - p 2 ) 5 c. n 1 p 8 1 5, n 1 (1 - p 8 1 ) 5, n 2 p 8 2 5, and n 2 (1 - p 8 2 ) 5 d. Choice b is the true requirement, but choice c is the one you actually check. ANS: D PTS: 1 REF: SECTION 13.5 132. For testing the difference between two population proportions, the pooled proportion estimate is found by taking: a. the proportion of successes from sample 1 plus the proportion of successes from sample 2. b. the total number of successes in both samples divided by the total of both sample sizes. c. the difference between the proportion of successes in each sample. d. None of these choices. ANS: B PTS: 1 REF: SECTION 13.5
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2 133. The pooled proportion estimate is used when: a. the proportion of successes from sample 1 equals the proportion of successes from sample 2. b. the total number of successes in both samples divided by the total of both sample sizes equals 1. c. the null hypothesis states that the two population proportions differ by some non-zero number. d. None of these choices. ANS: D PTS: 1 REF: SECTION 13.5 TRUE/FALSE 134. In comparing two population means the statistic under consideration is p 8 1 - p 8 2 . ANS: F PTS: 1 REF: SECTION 13.5 135. The pooled proportion estimate is used when the null hypothesis states that the two population proportions differ by some non-zero number. ANS: F PTS: 1 REF: SECTION 13.5 136. The pooled proportion estimate is found by taking the proportion of successes from sample 1 plus the proportion of successes from sample 2. ANS: F PTS: 1 REF: SECTION 13.5 137. A required condition for using the normal approximation to the binomial in testing the difference between two population proportions is that n 1 p 1 30 and n 2 p 2 30. ANS: F
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This note was uploaded on 09/28/2010 for the course FINOPMGT 250 taught by Professor Kumar during the Spring '10 term at University of Massachusetts Boston.

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SME_8e_Ch_13_Section_5 - CHAPTER 13 SECTION 5: INFERENCE...

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