When a researcher directly controls or manipulates changes in the independent variable by exposing participants to the treatment conditions,
A) she is conducting a correlational study.
B) cause-and-effect relationships can be detected.
C) the correlational coefficient should be zero.
D) she is using a technique called matching.

Question

Quizplus · Accepted Answer

Controlling and manipulating changes in the independent variable is a key aspect of experimental research, which is designed to establish cause-and-effect relationships between variables.

When a Researcher Directly Controls or Manipulates Changes in the Independent