Cost to charge ratio (the percentage of the amount billed that represents the actual cost) for inpatient and outpatient services at 11 Oregon hospitals is shown in the following table (Oregon Department of Health Services, 2002). A scatterplot of the data is also shown.

The least squares regression line with y = inpatient costto charge ratio and x = outpatient cost to charge ratio is ˆ y = 21.1 1 1.29x.
a. Is the observation for Hospital 11 an influential observation? Justify your answer.
b. Is the observation for Hospital 11 an outlier? Explain.
c. Is the observation for Hospital = an influential observation? Justify your answer.
d. Is the observation for Hospital = an outlier? Explain.

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Cost-to-Charge Ratlo Hospital outpatient care Inpatient Care 63 75 75 100 45 48 71 10 100 Inpatient 100 50 45 65 75 Outpaticnt