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 10.

​(a) Construct a 90​% confidence interval about μ if the sample​ size, n, is 22.

​(b) Construct a 90​% confidence interval about μ if the sample​ size, n, is 15.

​(c) Construct an 80​% confidence interval about μ if the sample​ size, n, is 22.

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

Click the icon to view the table of areas under the​ t-distribution.

​(a) Construct a 90​% confidence interval about μ if the sample​ size, n, is 22.

Lower​ bound:?

Upper​ bound: ?

Answer 1