Ch09_Sect03_Keller MS_AISE TB

Ch09_Sect03_Keller MS_AISE TB - CHAPTER 9 SECTION 3:...

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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, , 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 2 , then the mean of equals: a. 1 + 2 b. 1 - 2 c. 1 / 2 d. 1 2 ANS: B PTS: 1 REF: SECTION 9.3 138. 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, , is a. always non-normal b. always normal c. approximately normal only if n 1 and n 2 are both larger than or equal to 30 d. approximately normal regardless of n 1 and n 2 ANS: C PTS: 1 REF: SECTION 9.3 139. If two random samples of sizes n 1 and n 2 are selected independently from two populations with variances and , then the standard error of the sampling distribution of the sample mean difference, , equals: a. b. c. d. ANS: D PTS: 1 REF: SECTION 9.3 This edition is intended for use outside of the U.S. only, with content that may be different from the U.S. Edition. This may not be resold, copied, or distributed without the prior consent of the publisher.
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140. The standard deviation of is also called the: a. standard error of the difference between two sample means. b. standard deviation of the difference between the population means. c.
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Ch09_Sect03_Keller MS_AISE TB - CHAPTER 9 SECTION 3:...

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