Use the Following Information for the Question Below

question 108

Multiple Choice

Use the following information for the question below:
You conduct a clinical trial to test whether a new drug relieves the symptoms of arthritis better than a placebo.You have four groups of participants,all of whom have moderately painful arthritis (rated 7 on a scale of 1 to 10) .Each group receives a daily pill as follows: group 1-placebo;group 2-15 mg;group 3-25 mg;group 4-50 mg.At the end of 2 weeks,participants in each group are asked to rate their pain on a scale of 1 to 10.
What is the independent variable in this experiment?

• A) the level of pain experienced
• B) the different drug treatment groups
• C) the degree to which symptoms changed
• D) the drug itself
• E) the amount of pain experienced at the end of the experiment by the different drug treatment groups