# Critical Value for a right-tail test of means

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

https://brainmass.com/statistics/hypothesis-testing/critical-value-for-a-right-tail-test-of-means-224096

#### Solution Preview

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 ...

#### Solution Summary

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