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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
The weekly cash inflows (x) and outflows (y) of a business firm are random variables. The following data give values of x and y for 30 weeks. Assume that x and yare normally distributed.
x y x y x y
42 25 70 39 93 20
65 37 82 36 86 68
76 83 90 82 68 72
92 36 68 30 53 60
37 73 82 72 87 65
47 23 28 39 63 80
27 97 61 27 47 62
23 36 75 38 52 36
63 70 83 27 38 43
40 51 60 78 90 57
(a) Obtain unbiased estimates of the means and variances of x, y, and x - y. Also obtain 95% confidence intervals for these six variables.
(b) Test the hypothesis µx > µ assuming that:
(1) x and yare independent.
(2) x and yare correlated.
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