A group of experimenters want to test the effectiveness of a well-known and expensive brand of pain pills 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

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The double-blind procedure would be the best choice in this situation because it allows the experimenters to control for any expectations or biases that may influence the results. Neither the experimenters nor the participants know which brand of pain pills is being administered, so any observed differences in effectiveness can be attributed solely to the actual effects of the pills rather than to any preconceptions about their brand or price. Random sampling, replication, and operational definitions are all important aspects of a rigorous experimental design, but they do not specifically address the issue of expectations and biases in this case.

A Group of Experimenters Want to Test the Effectiveness of a Well-Known