An experiment is conducted to test a new antianxiety drug. After taking the drug, 35 percent of the participants receiving the medication report less anxiety, compared to 36 percent of those taking a placebo. The researchers should conclude that:
A) participants knew which group they were in.
B) the medication itself probably has no real effect on anxiety.
C) the drug actually increases anxiety.
D) the drug is an effective treatment for anxiety.

Question

Quizplus · Accepted Answer

The difference between the percentage of participants reporting less anxiety in the medication group versus the placebo group is negligible; therefore, the researchers should conclude that the medication itself probably has no real effect on anxiety. Choice A is not a valid conclusion because the experiment design likely included methods to prevent participants from knowing which group they were in. Choice C is not supported by the data given, as it indicates the drug increased anxiety, which is not shown in the comparison between the medication and placebo groups. Choice D may or may not be true, but the given data alone is not strong enough to support this conclusion.

An Experiment Is Conducted to Test a New Antianxiety Drug