Question

Both the researchers and the participants in a memory study are ignorant about which participants have actually received a potentially memory-enhancing drug and which have received a placebo. This investigation involves the use of _______.

Answer 1

The question is incomplete as it does not have the options which are-

A. naturalistic observation

B. the hindsight bias

C. random sampling

D. the double-blind procedure

E. replication

Answer:

D. the double-blind procedure

Step-by-step explanation:

The double-blind experiment are the experiments in which both the examiner or researcher and the participant or subject is unaware of that which subject will receive the experimental treatment of the experiment.

The double-blind experiment is performed to ensure that the experimenter is not biased when the subjects have placebo effects.

The test is used to determine the action of the drug on the participants in which the placebo are also used which give the same appearance of the drug but no drug is present in the substance.

Thus, Option-D is the correct answer.