To ensure that other researchers can repeat their work,psychologists use

A) control groups.
B) random assignment.
C) double-blind procedures.
D) operational definitions.

Operational Definitions

Specifications of the procedures or operations used to measure or manipulate a variable in research, making the variable empirically testable.

Double-blind Procedures

are experimental protocols where neither the participants nor the experimenters know who is receiving the treatment versus the control condition, to reduce bias.

Random Assignment

A method used in experiments to place participants into groups in a way that each participant has an equal chance of being assigned to any group, ensuring unbiased distribution.