Applied Statistics in Business and Economics
5th Edition
ISBN: 9781259329050
Author: DOANE
Publisher: MCG
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Chapter 8.4, Problem 13SE
A random sample of 25 items is drawn from a population whose standard deviation is known to be σ = 40. The sample
- a. Construct an
interval estimate for μ with 95 percent confidence. - b. Repeat part a assuming that n = 50.
- c. Repeat part a assuming that n = 100.
- d. Describe how the confidence interval changes as n increases.
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28. (a) Under what conditions do we say that two random variables X and Y are
independent?
(b) Demonstrate that if X and Y are independent, then it follows that E(XY) =
E(X)E(Y);
(e) Show by a counter example that the converse of (ii) is not necessarily true.
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