A researcher designs a study to determine if using pain relievers like Advil affect the rate at which stress fractures heal. He collaborates with an orthopedist to recruit young athletes who have been diagnosed with stress fractures. Half the group is given Advil, and the other half is given a sham pill. Neither the researchers nor the athletes know which pill they're taking. What type of study is this?
A. An in vitro randomized, placebo controlled trial
B. A randomized, double blind, placebo-controlled trial
C. A longitudinal, dependent variable, controlled trial
D. A blind, randomized cross sectional , independent variable trial
Answer: B
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Answer the following statement true (T) or false (F)
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