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A researcher randomly assigns 50 patients to receive either a standard pain reliever or an experimental one, and neither patients nor the physician measuring pain levels know which drug was given. Later, the experimental group showed less pain on average. The appropriate conclusion is:
A researcher randomly assigns 50 patients to receive either a standard pain reliever or an experimental one, and neither patients nor the physician measuring pain levels know which drug was given. Later, the experimental group showed less pain on average. The appropriate conclusion is: