An endodontist is interested in assessing the effects of 2 medications to provide pain relief for his patients following a root canal procedure. Two patients are randomly assigned to each medication. The procedure is performed and the patients given medication. The patients are asked to indicate their level of pain on a scale from 1 to 10 twice, 4 hours after the procedure and 8 hours after the procedure.
a. Perform a repeated-measures ANOVA and interpret the results.
b. Critique the experiment in light of your analysis. Indicate two specific changes that would improve the experiment.