Carver Memorial Hospital's surgeons have a new procedure that they think will decrease the time to perform an appendectomy. A sample of 8 appendectomies using the old method had a mean of 38 minutes with a variance of 36 minutes, while a sample of 10 appendectomies using the experimental method had a mean of 29 minutes with a variance of 16 minutes. For a right-tailed test for equal means (assume equal variances), the critical value at α = .10 is:
A)1.746
B)1.337
C)2.120
D)2.754

Question

Quizplus · Accepted Answer

The critical value for a right-tailed t-test with α = 0.10 and degrees of freedom calculated from the sample sizes and variances is approximately 1.337.

Carver Memorial Hospital's Surgeons Have a New Procedure That They