Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
6th Edition
ISBN: 9781337589383
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Chapter 21.5, Problem 10E

A population was divided into three strata with N1 = 300. with N2 = 600. and with N3 = 500. From a past survey, the following estimates for the standard deviations in the three strata are available: s1 = 150. s2 = 75. s3 = 100.

  1. a. Suppose an estimate of the population mean with a bound on the error of estimate of B = 20 is required. How large must the sample be? How many elements should be allocated to each stratum?
  2. b. Suppose a bound of B = 10 is desired. How large must the sample be? How many elements should be allocated to each stratum?
  3. c. Suppose an estimate of the population total with a bound of B = 15,000 is requested. How large must the sample be? How many elements should be allocated to each stratum?
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Let Y be a continuous RV with PDF   otherwise Find the CDF, Fry), of Y . Find an expression for pth, p € (0, 1), quantile of the distribution. Find E(Y) and V(Y). Find E(-2Y + 1) and V(-3Y - 2). Find E(Y3).
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