A random sample of 15 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. 7, 5, 5, 9, 6, 7, 9, 9, 10, 11, 7, 11, 10, 5, 6 Send data to calculator Send data to Excel Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: U Upper limit:

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A random sample of 15 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.
7, 5, 5, 9, 6, 7, 9, 9, 10, 11, 7, 11, 10, 5, 6
Send data to calculator
Send data to Excel
Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars. Then find
the lower limit and upper limit of the 90% confidence interval.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)
Lower limit:||
Upper limit: I
Transcribed Image Text:A random sample of 15 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. 7, 5, 5, 9, 6, 7, 9, 9, 10, 11, 7, 11, 10, 5, 6 Send data to calculator Send data to Excel Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit:|| Upper limit: I
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