A random sample of 13 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, 6, 10, 9, 11, 6, 10, 7, 11,8,7, 12, 5 

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. I 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.