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You are interested in finding a 98% confidence interval for the average commute that non-residential students have to their college. The data below show the number of commute miles for 12 randomly selected non-residential college students. Round answers to 3 decimal places where possible.
15 25 18 7 19 22 25 11 13 16 12 15
a. To compute the confidence interval use a (t or z) distribution.
b. With 98% confidence the population mean commute for non-residential college students is between ____ and _____ miles.
c. If many groups of 12 randomly selected non-residential college students are surveyed, 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 commute miles and about _____ percent will not contain the true population mean number of commute miles.
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