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 113, and the sample standard deviation, s, is found to be 9. (a) Construct a 98% confidence interval about ? if the sample size, n, is 27. (b) Construct a 98% confidence interval about ? if the sample size, n, is 15. (c) Construct a 96% confidence interval about ? if the sample size, n, is 27. (d) Should the confidence intervals in parts (a)-(c) have been computed if the population had not been normally distributed? (a) Construct a 98% confidence interval about ? if the sample size, n, is 27. Lower bound: Upper bound: (Round to one decimal place as needed.)

          A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 113, and the sample standard deviation, s, is found to be 9.
(a) Construct a 98% confidence interval about ? if the sample size, n, is 27.
(b) Construct a 98% confidence interval about ? if the sample size, n, is 15.
(c) Construct a 96% confidence interval about ? if the sample size, n, is 27.
(d) Should the confidence intervals in parts (a)-(c) have been computed if the population had not been normally distributed?
(a) Construct a 98% confidence interval about ? if the sample size, n, is 27.
Lower bound: Upper bound:
(Round to one decimal place as needed.)

A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 113, and the sample standard deviation, s, is found to be 9.
(a) Construct a 98% confidence interval about ? if the sample size, n, is 27.
(b) Construct a 98% confidence interval about ? if the sample size, n, is 15.
(c) Construct a 96% confidence interval about ? if the sample size, n, is 27.
(d) Should the confidence intervals in parts (a)-(c) have been computed if the population had not been normally distributed?
(a) Construct a 98% confidence interval about ? if the sample size, n, is 27.
Lower bound: Upper bound:
(Round to one decimal place as needed.)

Added by Cynthia F.

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