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# Carver Memorial Hospital's surgeons have a new procedure that they think will decrease the time to perform an appendectomy.

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. Use α = .10 for all tests.For a right-tail test of means (assume equal variances) the critical value is