SME_8e_Ch_10_Section_3

# SME_8e_Ch_10_Section_3 - CHAPTER 10 SECTION 3 INTRODUCTION...

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1 CHAPTER 10 SECTION 3: INTRODUCTION TO ESTIMATION MULTIPLE CHOICE 123. Which of the following statements is false regarding the sample size needed to estimate a population mean? a. It is directly proportional to the population variance. b. It is directly proportional to the square of z α / 2 . c. It is directly proportional to the square of the maximum allowable error B. d. None of these choices. ANS: C PTS: 1 REF: SECTION 10.3 124. The sample size needed to estimate a population mean within 2 units with a 95% confidence when the population standard deviation equals 8 is 125. When determining the sample size necessary for estimating the true population mean, which factor is not of our concern when sampling with replacement? 126. To estimate the mean of a normal population whose standard deviation is 6, with a bound on the error of estimation equal to 1.2 and confidence level 99% requires a sample size of at least: 127. The sample size needed to estimate a population mean to within 10 units was found to be 68. If the population standard deviation was 50, then the confidence level used was: a. 99% b. 95% c. 90% d. None of these choices. ANS: C PTS: 1 REF: SECTION 10.3

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