DrRose Conducts a Study to Determine If Caffeine Can Aid

Multiple Choice

Dr.Rose conducts a study to determine if caffeine can aid memory.Her three groups of subjects receive a high dose,a low dose,or no caffeine.They all receive identical-looking pills so that they are unaware of how much caffeine they take.In addition,when the researcher tests the memory of each subject,she is not aware of what group each subject is in.This research design utilizes which of the following?

A) random assignment
B) single-blind technique
C) double-blind technique
D) self-selection bias