A Consumer Reports Group Is Interested in Which Medicine Works

Multiple Choice

A consumer reports group is interested in which medicine works the best. The researchers take 100 volunteers who experience regular head-aches and who are currently not taking any medications. The Researcher split them into four groups of 25 individuals. Group 1 receives four 100-mg doses of Excedrin each day, group 2 receive four 100-mg doses of Tylenol each day, group 3 receives four 100-Mg doses of Advil each day, and group 4 receives four 100-mg doses of a sugar pill each day. After One week, the researchers compare the number of reported head-aches. If the individuals in each group Were unaware of which drug they were receiving, but the researchers knew which group were paired With which drug, then this study is said to be

A) a placebo study.
B) a double blind study.
C) a blind study.
D) a census survey.
E) None of the above.