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SME_8e_Ch_13_Section_4

# SME_8e_Ch_13_Section_4 - CHAPTER 13 SECTION 4 INFERENCE...

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1 CHAPTER 13 SECTION 4: INFERENCE ABOUT COMPARING TWO POPULATIONS MULTIPLE CHOICE 87. The ratio of two independent chi-squared variables divided by their degrees of freedom is: a. normally distributed b. Student t -distributed c. chi-squared distributed d. F- distributed ANS: D PTS: 1 REF: SECTION 13.4 88. The F- distribution is the sampling distribution of the ratio of: 89. Which of the following statements is false for an F- distribution? 90. The sampling distribution of the ratio of two sample variances s 1 2 / s 2 2 is said to be F -distributed provided that: 91. When testing for the difference between two population variances with sample sizes of n 1 = 8 and n 2 = 10, the degrees of freedom are: a. 8 and 10 b. 7 and 9 c. 2 and 18 d. 18 and 2 ANS: B PTS: 1 REF: SECTION 13.4

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2 92. Which of the following statements is correct regarding the percentile points of the F- distribution? 93. In testing for the equality of two population variances, when the populations are normally distributed, the 10% level of significance has been used. To determine the rejection region, it will be necessary to refer to the F table corresponding to an upper-tail area of: 94. The statistical distribution used for testing the difference between two population variances is the
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