In Example 10.6 on page 411, we conducted a nonpooled t-test, at the 5% significance level, to decide whether the mean operative time is less with the dynamic system than with the static system.
a. Using a pooled t-test, repeat that hypothesis test.
b. Compare your results from the pooled and nonpooled t-tests.
c. Repeat both tests, using a 1% significance level, and compare your results.
d. Which test do you think is more appropriate, the pooled or nonpooled t-test? Explain your answer.