Social Variables Researchers implanted electrical devices into patients diagnosed with congestive heart failure.They randomly assigned patients to either an experimental condition (device turned on) or control condition (device turned off) for 6 months.Neither the subjects nor the supervising physicians knew their treatment condition until the study ended.Which design did these researchers use?
A)double-blind experiment
B)ex post facto study
C)pretest/posttest
D)single-blind experiment

Question

Quizplus · Accepted Answer

The researchers used a double-blind experiment design, as neither the subjects nor the supervising physicians knew their treatment condition until the study ended. This helps to control for bias and placebo effects.

Social Variables Researchers Implanted Electrical Devices into Patients Diagnosed with Congestive