A researcher would like to test the effectiveness of a cough medicine in people with COPD. Each participant will take a placebo one week and the new cough medicine the other week (the order is randomized). The resulting data will include 40 scores for the medicine and 40 scores for the placebo for each person. They type of test used to analyze this data would be:
a. The two-sample T-test
b. The one-sample T-test
c. The matched pairs T-test
d. None of the above