Experiment Terminology

Researchers wanted to know which treatment is more effective for relieving joint pain: an ibuprofen pill, or a newly-developed topical ointment rubbed on the affected joint. Fifty subjects agreed to participate in the experiment. Researchers had the following supplies on hand:

real ibuprofen pills;
pills that looked and tasted like ibuprofen pills but which were actually made of an inert substance;
the real topical ointment;
a topical ointment that looked and felt like the real ointment but which actually has no affect on the body.

Twenty-five of the subjects were randomly selected to take the real pills and use the fake ointment. The remaining twenty-five used the fake pills and the real ointment. The subjects did not knew that they were using one real and one fake item, but they did not know which was which.

At the end of the period of study, each patient reported their decrease in pain on a numerical scale form 0 to 10, where 0 stands for "no decrease in pain at all" and 10 stands for "my pain is all gone!"

Which of the following terms apply to this experiment? Select all correct answers.

Group of answer choices

( ) Completely Randomized Design

( ) Randomzed Block Design

( ) Matched Pairs Design

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