To investigate the effects of a new drug for hyperactivity, one group of children is given this new drug, while the other group is given a placebo. The researcher labels the drug and placebo will letter names and then has his assistant administer the pills and collect the data. Neither the research assistant nor the children will known who is getting the placebo and who is getting the new drug
until the end of the experiment. This researcher is using a
a. double-blind experiment to minimize research participant bias and researcher bias.
b. single-blind experiment to minimize observer bias and the observer effect.
c. natural experiment that incorporates random selection and random assignment.
d. placebo effect to maximize the self-fulfilling prophecy.
A
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