Medical researchers often test medicines on patients who have given informed consent for the tests. The researchers divide the patients into two groups. One group is given the medicine. The second group is given a harmless substitute such as sugar pills. Neither the patients nor the researchers know which patients have received the medicine and which have received the substitute. What is the purpose of such a procedure? to increase accuracy to increase precision to decrease bias to decrease patient safety

to decrease bias

Explanation:

The experimental procedure stated in the question is a blinded placebo test. This procedure seeks to reduce the bias in the experiment due to the "placebo effect."

The placebo effect is the effect whereby patients treated with a placebo (a dummy treatment) claim to be responding better to treatment methods.

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explanation: