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.
- 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?
- b. Suppose a bound of B = 10 is desired. How large must the sample be? How many elements should be allocated to each stratum?
- 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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Question 3
The following stem-and-leaf displays the weekly salary of employees at this firm.
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5
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i.
Determine the value of x, y and z.
[3]
ii. What is the value of the median?
[2]
iii.
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iv.
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[1]
[2]
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otherwise
Find the CDF, Fry), of Y .
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Find E(Y) and V(Y).
Find E(-2Y + 1) and V(-3Y - 2).
Find E(Y3).
Let X be a continuous RV with CDF
Find P(X < 0), P(-1 < X < 1) and P(0.5 < X).
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Find the PDF, fx (x), of X.
Chapter 21 Solutions
Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
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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