A sample of sizen=68is drawn from a normal population whose standard deviation is=7.7 The sample mean is=x 45.98

(a) Construct a95% confidence interval for Round the answer to at least two decimal places.

A95% confidence interval for the mean is ?< < ?

b) If the population were not approximately normal, would the confidence interval constructed in part (a) be valid ?Explain.

The confidence interval constructed in part (a)(would or would not) be valid since the sample size(is or is not)large.