Asimple random sample of size n is drawn from a population that is normally distributed. the sample mean, x overbarx, is found to be , and the sample standard deviation, s, is found to be 1010. (a) construct anan 8080% confidence interval about muμ if the sample size, n, is 1212. (b) construct anan 8080% confidence interval about muμ if the sample size, n, is 1818. (c) construct aa % confidence interval about muμ if the sample size, n, is 1212. (d) could we have computed the confidence intervals in parts () if the population had not been normally distributed? click the icon to view the table of areas under the t-distribution.