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A simple random sample of size n is drawn from a population that is normally distributed....

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Statistics

A simple random sample of size n is drawn from a population thatis normally distributed. The sample​ mean, x overbar​, is found tobe 109​, and the sample standard​ deviation, s, is found to be10.

​(a) Construct a 98​% confidence interval about mu if thesample​ size, n, is 18.

​(b) Construct a 98​% confidence interval about mu if thesample​ size, n, is 25. ​

(c) Construct a 99​% confidence interval about mu if the sample​size, n, is 18.

​(d) Could we have computed the confidence intervals in parts​(a)-(c) if the population had not been normally​ distributed?

Answer & Explanation Solved by verified expert
3.6 Ratings (499 Votes)
Refer ttable or use excel    See Answer
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