A random sample of  9  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. 11 ,  11 ,  6 ,  6 ,  9 ,  5 ,  5 ,  5 ,  12 Send data to calculator   Under the assumption that co-payment amounts are normally distributed, find a  95%  confidence interval for the mean co-payment amount in dollars. Then find the lower limit and upper limit of the  95%  confidence interval.

MATLAB: An Introduction with Applications
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A random sample of 

9

 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.

11
11
6
6
9
5
5
5
12
Send data to calculator
 

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

95%

 confidence interval for the mean co-payment amount in dollars. Then find the lower limit and upper limit of the 

95%

 confidence interval.

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