You are interested in finding a 90% confidence interval for themean number of visits for physical therapy patients. The data belowshow the number of visits for 12 randomly selected physical therapypatients. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a ? zt  distribution.
b. With 90% confidence the population mean number of visits perphysical therapy patient is between  and  visits.
c. If many groups of 12 randomly selected physical therapypatients are studied, then a different confidence interval would beproduced from each group. About  percent of theseconfidence intervals will contain the true population mean numberof visits per patient and about  percent will not containthe true population mean number of visits per patient.
