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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 110​, and the sample standard​ deviation, s, is found to be10.
​(a) Construct an 80​% confidence interval about μ if the sample​size, n, is 13.
​(b) Construct an 80​% confidence interval about μ if the sample​size, n, is 27.
​(c) Construct a 90​% confidence interval about μ if the sample​size, n, is 13.
​(d) Could we have computed the confidence intervals in parts​(a)-(c) if the population had not been normally​ distributed?

****** Need lower bound and upper bound *******

Answer & Explanation Solved by verified expert
3.6 Ratings (496 Votes)
an 13 110s 10 020SE s 10 27735ndf n 1 13 1 12From Table critical values of t 13562Confidence IntervalLower bound 110 13562 X 27735 110 37614 1062386Upper bound 110 13562 X 27735    See Answer
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