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When human subjects are used during drug tests, researchers usually perform double-blind experiments. In double-blind experiments, neither the researchers nor the human subjects know which subjects are receiving the actual drug (experimental group) and which are instead receiving an inactive placebo (control group). Double-blind experiments are conducted in order to A. decrease the accuracy of the data. B. reduce measurement errors. C. reduce sources of bias. D. improve the precision of the data.

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Answer:

The correct option is option C which is to reduce source of bias.

Explanation:

  • It is a human nature, if we know about something already and the we have to take decision from results, then we are biased on the bases of early information.
  • This is known as power of suggestion, means we suggest instead giving accurate results.
  • To reduce this biasness and power of suggestion double blind test are performed.