Question
A random sample of 18 health maintenance organizations (HMOs) was selected. For each HMO, the co-payment...
A random sample of 18 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: 10, 11, 6, 12, 8, 10, 10, 6, 11, 7, 9, 9, 12, 7, 8, 11, 8, 12 Under the assumption that co-payment amounts are normally distributed, find a confidence interval for the mean co-payment amount in dollars. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) What is the lower limit of the confidence interval? What is the upper limit of the confidence interval?
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