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 variance in the time it takes to perform an appendectomy.A sample of 8 appendectomies using the old method had a variance of 36 minutes,while a sample of 10 appendectomies using the experimental method had a variance of 16 minutes.At  = .10 in a two-tailed test for equal variances,the critical values are:

A) 0.272 and 3.29
B) 0.299 and 3.07
C) 0.368 and 2.51
D) -1.645 and +1.645