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You are interested in finding a 95% confidence interval for the mean number of visits for physical therapy patients. The data below show the number of visits for 13 randomly selected physical therapy patients.
27 13 20 79 28 27 10 17 20 116 12
a. To compute the confidence interval use a (t or z) distribution.
b. With 95% confidence the population mean number of visits per physical therapy patient is between _____ and ______ visits.
c. If many groups of 13 randomly selected physical therapy patients are studied, then a different confidence interval would be produced from each group. About ________ percent of these confidence intervals will contain the true population mean number of visits per patient and about ______ percent will not contain the true population mean number of visits per patient.
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