ER Wait Times The District of Columbia has some of the longest emergency room waiting times in the United States. Here are times (minutes) patients waited in District of Columbia emergency rooms before seeing a physician: 40, 68, 72, 67, 54, 59, 68, 47, 55, 74, 63, 73.

Use the bootstrap method with 1000 bootstrap samples.

a. Construct a 99% confidence interval estimate of the population mean. Is the result dramatically different from the 99% confidence interval that would be found using the confidence interval constructed by using the t distribution, as in Section 7-2?

b. Construct a 95% confidence interval estimate of the population standard deviation. Is the result dramatically different from the 95% confidence interval that would be found using the x2 distribution, as in Section 7-3?