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Critical Value for a right-tail test of means

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

1.746
1.337
2.120
2.754

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Calculates the critical value for a right-tail test of means.

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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 alpha (a) = .10 for all tests.For a right-tail test of means ...

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