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StatisticsQ&A LibraryA simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 111, and the sample standard deviation, s, is found to be 11. (a) Construct a 95% confidence interval about μ if the sample size, n, is 21. (b) Construct a 95% confidence interval about μ if the sample size, n, is 12. (c) Construct a 90% confidence interval about μ if the sample size, n, is 21.Start your trial now! First week only $4.99!*arrow_forward*

Question

A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 111,

and the sample standard deviation, s, is found to be 11.

and the sample standard deviation, s, is found to be 11.

(a) Construct a 95% confidence interval about μ if the sample size, n, is 21.

(b) Construct a 95% confidence interval about μ if the sample size, n, is 12.

(c) Construct a 90% confidence interval about μ if the sample size, n, is 21.

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

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