A random sample of

16

health maintenance organizations (HMOs) was selected. For each HMO, the co-payment (in dollars) for a doctor's office visit was recorded. The results are as follows.

29, 50, 34, 31, 30, 53, 29, 40, 46, 44, 34, 48, 29, 33, 33, 48

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Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars. Give the lower limit and upper limit of the 90% confidence interval.

Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.

Lower limit:

Upper limit: