A group of experimenters want to test the effectiveness of a well-known and expensive brand of pain medication against the effectiveness of a lesser-known and cheaper brand.To prevent any expectations about brand effectiveness from influencing their experimental test,the researchers are likely to make use of

A) random sampling.
B) replication.
C) operational definitions.
D) the double-blind procedure.

Double-Blind Procedure

A research method used to prevent bias, where neither the participants nor the experimenters know who is receiving a particular treatment.

Brand Effectiveness

Refers to the impact a brand has on its audience, including how well it achieves its marketing objectives and resonates with its target demographic.

Expensive Brand

A brand associated with high cost, often linked to high quality, luxury, and status.