Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "the average stay exceeds the guideline." At α = .025, the critical value for a right-tailed test of her hypothesis is:

Question

Quizplus · Accepted Answer

Given the significance level (α) of 0.025 for a right-tailed test and the sample size (n) of 16, which implies degrees of freedom (df) of 15 for t-distribution, the critical value closest to the given α in t-distribution tables is 2.131.

Guidelines for the Jolly Blue Giant Health Insurance Company Say