52. A random sample of 5726 telephone numbers from a certain region taken in March 2002 yielded...
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52. A random sample of 5726 telephone numbers from a certain region taken in March 2002 yielded 1105 that were unlisted, and 1 year later a sample of 5384 yielded 980 unlisted numbers.
a. Test at level .10 to see whether there is a difference in true proportions of unlisted numbers between the two years.
b. If p1 .20 and p2 .18, what sample sizes (m
n) would be necessary to detect such a difference with probability .90?
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Related Book For 
Modern Mathematical Statistics With Applications
ISBN: 9780534404734
1st Edition
Authors: Jay L Devore
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