Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
6th Edition
ISBN: 9781337115186
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Confidence Intervals
When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calcul…
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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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Chapter 21 Solutions

Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)

Ch. 21.4 - 1. Simple random sampling was used to obtain a...Ch. 21.4 - Prob. 2ECh. 21.4 - Prob. 3ECh. 21.4 - Prob. 4ECh. 21.4 - Prob. 5ECh. 21.4 - Prob. 6ECh. 21.5 - 7. A stratified simple random sample was taken...Ch. 21.5 - Prob. 8ECh. 21.5 - Prob. 9ECh. 21.5 - 10. A population was divided into three strata...
Ch. 21.5 - Prob. 11ECh. 21.5 - Prob. 12ECh. 21.5 - Prob. 13ECh. 21.6 - Prob. 14ECh. 21.6 - 15. A sample of six clusters is to be taken from a...Ch. 21.6 - Prob. 16ECh. 21.6 - Prob. 17ECh. 21 - Prob. 18SECh. 21 - Prob. 19SECh. 21 - Prob. 20SECh. 21 - Prob. 21SECh. 21 - Prob. 22SECh. 21 - Prob. 23SECh. 21 - 24. A public agency is interested in learning more...
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