Complete the following:
Q1. 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:
1.746
1.337
2.12
2.754
Q2. For the means, the test statistic (assuming equal variances) is:
3.814
2.365
3.000
1.895
Q3. To test for equal variances, the critical values are:
3.73 and 0.228
2.51 and 3.67
3.07 and 0.398
3.29 and 0.272