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:5, 6, 12, 10, 6, 8, 8, 11, 5, 9, 10, 12, 6, 12, 7, 9, 10, 8, 7Under the assumption that co-payment amounts are normally distributed, find a 95% confidence interval forthe 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 decimalplace. (If necessary, consult a list of formulas.)What is the lower limit of the confidenceinterval?What is the upper limit of the confidenceAainterval?

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Asked Mar 14, 2020
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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:
5, 6, 12, 10, 6, 8, 8, 11, 5, 9, 10, 12, 6, 12, 7, 9, 10, 8, 7
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
Aa
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: 5, 6, 12, 10, 6, 8, 8, 11, 5, 9, 10, 12, 6, 12, 7, 9, 10, 8, 7 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 Aa interval?

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Expert Answer

Step 1

Statistics homework question answer, step 1, image 1

Step 2

The column above represents the sample data.

Sample size (n) = 19

The sample mean and sample standard deviation can be computed from the sample data as:

Statistics homework question answer, step 2, image 1

Step 3

Since, sample size is less than 30 and population standard deviation is not known therefore, t-would be applicable.

T-critical value at 0.05 significance level  with 18 degrees of freedom is –

Statistics homework question answer, step 3, image 1

t-critical value is taken from the t-able.

Thus, the 95% confidence interval can be computed as:

Statistics homework question answer, step 3, image 2

...

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