A researcher conducting a study testing the effects of caffeine on attention is concerned about experimenter bias. The way for her to reduce this problem would be to

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The best choice to reduce experimenter bias would be to use the double-blind technique, where neither the researcher nor the participants know who is receiving the caffeine or the placebo. This helps to eliminate any potential bias from the researcher's expectations or behavior towards the participants. Random assignment and the use of a placebo are also important factors in reducing bias, but they do not directly address the issue of experimenter bias. Bearing in mind the potential placebo effect is also important, but it does not directly reduce experimenter bias.

A Researcher Conducting a Study Testing the Effects of Caffeine