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

Multiple Choice

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-tail test for equal means (assume equal variances) ,the critical value at  = .10 is:

A) 1.746
B) 1.337
C) 2.120
D) 2.754