(Ch 8.5) The owner of Torpid Oaks B&B wanted to know the average distance its guests had traveled. A random sample of 16 guests was collected with mean 85 miles and standard deviation 32 miles. The corresponding 90 percent confidence interval (in miles) for the population mean is approximately [Hint: Need to use the sample standard deviation and a student t statistic]

Select one:

a. (71.0, 99.0) b. (71.8, 98.2) c. (74.3, 95.7) d. (68.7, 103.2)