SME_8e_Ch_09_Section_3

SME_8e_Ch_09_Section_3 - CHAPTER 9 SECTION 3 SAMPLING...

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1 CHAPTER 9 SECTION 3: SAMPLING DISTRIBUTIONS MULTIPLE CHOICE 136. If two populations are normally distributed, the sampling distribution of the difference in the sample means, X 1 - X 2 , is: a. approximately normal for any sample sizes. b. approximately normal if both sample sizes are large. c. exactly normal for any sample sizes. d. exactly normal only if both sample sizes are large. ANS: C PTS: 1 REF: SECTION 9.3 137. If two random samples of sizes n 1 and n 2 are selected independently from two populations with means μ 1 and μ 2 , then the mean of X 1 - X 2 equals: 138. If two random samples of sizes n 1 and n 2 are selected independently from two non-normally distributed populations, then the sampling distribution of the sample mean difference, X 1 - X 2 , is 139. If two random samples of sizes n 1 and n 2 are selected independently from two populations with variances σ 1 2 and σ 2 2 , then the standard error of the sampling distribution of the sample mean difference, X 1 - X 2 , equals: 2 - σ 2 2 ) / n 1 n 2 2 n 1 - σ 2 2 n 2 2 n 1 - σ 2 2 n 2 2 n 1 + σ 2 2 n 2

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