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$\alpha$ = .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

Question

Quizplus · Accepted Answer

Using the F-distribution table with 7 degrees of freedom in the numerator and 9 degrees of freedom in the denominator (the smaller sample size minus 1), and alpha level of .10 (two-tailed), the critical values are 0.272 and 3.29. Therefore, the best choice is A.

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

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