Ch08_Sect04_Keller MS_AISE TB

# Ch08_Sect04_Keller MS_AISE TB - CHAPTER 8 SECTION 4...

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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? a. F 0.10,10,20 = 1/ F 0.90,10,20 b. F 0.10,10,20 = 1/ F 0.10,20,10 c. F 0.90,10,20 = 1/ F 0.90,20,10 d. F 0.90,10,20 = 1/ F 0.10,20,10 ANS: D PTS: 1 REF: SECTION 8.4 172. The Student t distribution: a. is symmetrical. b. approaches the normal distribution as the degrees of freedom increase. c. has more area in the tails than the standard normal distribution does. d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 8.4 173. The Student t distribution with parameter v = 2 has a mean E ( t ) equal to: a. 2 b. 1 c. 0 d. None of these choices. ANS: C PTS: 1 REF: SECTION 8.4 174. 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 8.4 175. What number corresponds to t 0.05,10 ? a. 1.812 b. 1.372 c. 2.228 d. 1.833 ANS: A PTS: 1 REF: SECTION 8.4 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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176. If P ( t > t .01, v ) = 2.50, then the number of degrees of freedom v is: a. 20 b. 21 c. 22 d. 23 ANS: D PTS: 1 REF: SECTION 8.4 177. What number corresponds to ? a. 28.30 b. 26.22 c. 21.00 d. 5.23 ANS: C PTS: 1 REF: SECTION 8.4 178. If , 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 ? a. 0.166 b. 6.040 c. 0.260 d. 3.840 ANS: A PTS: 1 REF: SECTION 8.4 180. What number corresponds to F .025,3,5 ? a. 14.88 b. 7.76 c. 12.06 d. 5.41 ANS: B PTS: 1 REF: SECTION 8.4 181. Suppose X has a chi-squared distribution with 10 degrees of freedom. The mean of X is: a. 10 b. 9 c. 20 d. None of these choices. ANS: A PTS: 1 REF: SECTION 8.4 182. Suppose X has a chi-squared distribution with 10 degrees of freedom. The variance of X is: a. 10 b. 9 c. 20 d. None of these choices. ANS: C PTS: 1 REF: SECTION 8.4 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.
183. The number of parameters for an F distribution is: a. 1 b. 2

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## This note was uploaded on 04/08/2012 for the course ADMS 2320 taught by Professor Rochon during the Spring '08 term at York University.

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Ch08_Sect04_Keller MS_AISE TB - CHAPTER 8 SECTION 4...

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