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

question 18

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 of equal means (assume equal variances) ,the pooled variance is:

• A) 14.76
• B) 26.00
• C) 24.75
• D) 27.54

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