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(HMOs) was selected. For each...

A random sample of 19 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:

12, 8, 11, 5, 7, 8, 8, 9, 6, 7, 10, 10, 6, 12, 5, 11, 10, 11, 6

Under the assumption that co-payment amounts are normally distributed, find a 95% 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?

12, 8, 11, 5, 7, 8, 8, 9, 6, 7, 10, 10, 6, 12, 5, 11, 10, 11, 6

Under the assumption that co-payment amounts are normally distributed, find a 95% 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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