A research team is studying a new pain medication for patients suffering from fibromyalgia. Patients suffering from chronic pain as a result of fibromyalgia were divided into two categories: Treatment and Placebo. Patients in the treatment group were injected with the new drug while patients in the placebo group were injected with saline solution. Neither the patients, nor the health care practitioners admininstering the study knew who was receiving the actual drug.

After two weeks the patients were asked to pick whichcategory(1-10) their pain abatement fit into, where 1 meant they were no longer in pain, while 10 meant they had no change.

Based on the experimental design of this study and the kind of data generated, which statistical test should be used to determine if pain relief was independent of treatment group?

A. ANOVA

B. Linear Regression with t-test for significance of slope

C. Paired t-test

D. One-sample t-test

E. Chi Squared Test

F. Two-sample t-test