Question

. An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining

that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard

deviation of $78.11. At the .05 level of signi cance, does this sample prove a violation of the guideline

that the average patient should pay no more than $250 out-of-pocket? What are the null hypothesis, test statistic, and decision rule?

Answer 1