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: 9, 5, 8, 7, 9, 8, 10, 11, 12, 11, 5, 6, 7, 7, 12, 10, 6, 10, 6 Under the assumption that co-payment amounts are normally distributed, find a  90%  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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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:
9, 5, 8, 7, 9, 8, 10, 11, 12, 11, 5, 6, 7, 7, 12, 10, 6, 10, 6
Under the assumption that co-payment amounts are normally distributed, find a 
90%
 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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