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

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A simple random sample of size n is drawn from a population thatis normally distributed. The sampleâ€‹ mean, x overbarâ€‹, is found tobe 110â€‹, and the sample standardâ€‹ deviation, s, is found to be10.
â€‹(a) Construct an 80â€‹% confidence interval about Î¼ if the sampleâ€‹size, n, is 13.
â€‹(b) Construct an 80â€‹% confidence interval about Î¼ if the sampleâ€‹size, n, is 27.
â€‹(c) Construct a 90â€‹% confidence interval about Î¼ if the sampleâ€‹size, n, is 13.
â€‹(d) Could we have computed the confidence intervals in partsâ€‹(a)-(c) if the population had not been normallyâ€‹ distributed?
Need lower bound and upper bound *

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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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