Ch16_Sect05_Keller MS_AISE TB

Ch16_Sect05_Keller MS_AISE TB - CHAPTER 16 SECTION 5:...

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Unformatted text preview: CHAPTER 16 SECTION 5: SIMPLE LINEAR REGRESSION AND CORRELATION MULTIPLE CHOICE 207. In order to estimate with 95% confidence the expected value of y for a given value of x in a simple linear regression problem, a random sample of 10 observations is taken. Which of the following t-table values listed below would be used? a. 2.228 b. 2.306 c. 1.860 d. 1.812 ANS: B PTS: 1 REF: SECTION 16.5 208. In order to predict with 90% confidence the expected value of y for a given value of x in a simple linear regression problem, a random sample of 10 observations is taken. Which of the following t-table values listed below would be used? a. 2.228 b. 2.306 c. 1.860 d. 1.812 ANS: C PTS: 1 REF: SECTION 16.5 209. The confidence interval estimate of the expected value of y for a given value x , compared to the prediction interval of y for the same given value of x and confidence level, will be: a. wider. b. narrower. c. the same. d. impossible to know. ANS: B PTS: 1 REF: SECTION 16.5 210. The width of the confidence interval estimate for the predicted value of y depends on a. the standard error of the estimate b. the value of x for which the prediction is being made c. the sample size d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 16.5 211. In order to predict with 80% confidence the expected value of y for a given value of x in a simple linear regression problem, a random sample of 15 observations is taken. Which of the following t-table values listed below would be used? a. 1.350 b. 1.771 c. 2.160 d. 2.650 ANS: A PTS: 1 REF: SECTION 16.5 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. 212. In order to predict with 98% confidence the expected value of y for a given value of x in a simple linear regression problem, a random sample of 15 observations is taken. Which of the following t-table values listed below would be used? a. 1.350 b. 1.771 c. 2.160 d. 2.650 ANS: D PTS: 1 REF: SECTION 16.5 TRUE/FALSE 213. The confidence interval estimate of the expected value of y will be narrower than the prediction interval for the same given value of x and confidence level. This is because there is less error in estimating a mean value as opposed to predicting an individual value. ANS: T PTS: 1 REF: SECTION 16.5 214. The confidence interval estimate of the expected value of y will be wider than the prediction interval for the same given value of x and confidence level. This is because there is more error in estimating a mean value as opposed to predicting an individual value. ANS: F PTS: 1 REF: SECTION 16.5 215. The prediction interval for a particular value of y is always wider than the confidence interval for mean value of y , given the same data set, x value, and confidence level....
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This note was uploaded on 04/08/2012 for the course ADMS 2320 taught by Professor Rochon during the Fall '08 term at York University.

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Ch16_Sect05_Keller MS_AISE TB - CHAPTER 16 SECTION 5:...

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