Exercise

Comparing means

In a previous exercise, we derived the percentage change from baseline in headache score at Month 12, pct.month12, in the Acupuncture dataset. Here, we will use the two-sample t-test to compare the means in the two treatment groups.

We will also re-run the t-test with compareGroups to generate a nice summary. The compareGroups library and Acupuncture dataset have been preloaded for this session.

Instructions

100 XP

Use the t.test() function to test that the means of pct.month12 are equal in the treatment groups, treatment.group. Assume equal variances.
Use compareGroups() to re-run the t-test (this is the default test within the function).
UsecreateTable() to save the results.
Display the summary.