A Randomized Controlled Study Is Done to Determine Whether or Not

Essay

A randomized controlled study is done to determine whether or not taking a specific herbal supplement causes stress levels to decrease. Sixty individuals are broken into two groups of size thirty. The first group receives a 10 mg dose of an herbal supplement each day while the second group receives a 10 mg dose of a sugar pill made to resemble the herbal supplement each day. After two months the stress levels of each group are measured. The 10 mg sugar pill is an example of a what?