A researcher gives half of her participants a new anti-anxiety pill and the other half a placebo pill. She does not tell participants whether they have received an active treatment pill or a sugar pill. This is an example of what type of study?
a. a prospective study
b. a single-blind study
c. a double-blind study
d. a observational study
Question 2
A subject in your study correctly assumes that you are interested in whether people behave in a prejudicial way towards people of a homosexual orientation. She then goes out of her way to act friendly and nice. This represents an example of ______________
a. the placebo effect
b. participant bias
c. error
d. experimenter bias
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