"Double-arm" trials, in which one group receives a treatment while another does
not, and then the treatment groups are reversed, are based upon the joint method of agreement and difference.

Question

"Double-arm" trials, in which one group receives a treatment while another does
 not, and then the treatment groups are reversed, are based upon the joint method of agreement and difference.

Quizplus · Accepted Answer

Double-arm trials use the joint method of agreement and difference by comparing outcomes between the treatment and control groups to identify causal relationships.

"Double-Arm" Trials, in Which One Group Receives a Treatment While