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A random sample of ? measurements was selected from a population with standard deviation ?=11.7 and...

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Basic Math

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
?. ?. ?

Answer & Explanation Solved by verified expert
3.7 Ratings (393 Votes)
a90 confidence interval for is Z sqrtn Z sqrtn721 1645 117 sqrt40    See Answer
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