A random sample of ? measurements was selected from a population
with standard deviation ?=11.7 and...
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A random sample of ? measurements was selected from a populationwith standard deviation ?=11.7 and unknown mean ?. Calculate a 90 %confidence interval for ? for each of the following situations:
(a) ?=40, ?=72.1 ?. ? ?
(b) ?=60, ?=72.1 ? ?
(c) ?=85, ?=72.1 ?. ?. ?
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3.7 Ratings (393 Votes)
a90 confidence interval for is Z sqrtn Z sqrtn721 1645 117 sqrt40
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