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SME_8e_Ch_08_Section_4 - CHAPTER 8 SECTION 4 CONTINUOUS...

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1 CHAPTER 8 SECTION 4: CONTINUOUS PROBABILITY DISTRIBUTIONS MULTIPLE CHOICE 170. Which of the following statements is false? a. The chi-squared distribution is positively skewed. b. All the values of the chi-squared distribution are non-negative. c. The shape of the chi-squared distribution depends on its degrees of freedom. d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 8.4 171. Which of the following statements is correct regarding the percentile points of the F distribution? 172. The Student t distribution: 173. The Student t distribution with parameter v = 2 has a mean E ( t ) equal to: 174. The Student t distribution with parameter v = 4 has a variance V ( t ) equal to: a. 4 b. 0 c. 2 d. 1 ANS: C PTS: 1 REF: SECTION 8.4
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2 175. What number corresponds to t 0.05,10 ? 176. If P ( t > t .01, v ) = 2.50, then the number of degrees of freedom v is: 177. What number corresponds to χ 0.05,12 2 ? 178. If P ( X 2 X .025, v 2 ) = 14.4 , then the number of degrees of freedom v is: a. 5 b. 6 c. 7 d. 8 ANS: B PTS: 1 REF: SECTION 8.4 179. What number corresponds to F 0.95,4,8 ?
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