To investigate the effects of a new drug for hyperactivity, one group of children is given this new drug, while the other group is given a placebo. In order to minimize both research participant bias and researcher bias, this experimenter has his assistant label the drug and the placebo with a letter name so that he will not know which group of children is getting the placebo and which group is getting the new drug until the end of the experiment. This researcher is using.

The correct answer is double- blind experiment to minimize research participate bias and researcher bias

Double-blind Experiment is a method of clinical trial carried out on human beings where neither the examine nor the examiner knows what is being used as a variable at any given time. It is commonly used as a criterion for validating quantitative experimental practices in science.

Without this intellectual tool, it would be very difficult to carry out any scientific tests involving human beings with confidence. The purpose of the double-blind test is to avoid any conscious or unconscious interference with the results of an experiment.

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