You want to know the effect of a new drug on an individual\'s blood pressure. Yo

Question

You want to know the effect of a new drug on an individual's blood pressure. You randomize people into two group: control group and treatment group. The treatment group is given the drug to take at home and the control group is not given any drug. When the people report back the next day, you measure their blood pressure and decide that the difference in average outcomes oftreatment and control is the casual effect of the drug. Why is this experiment not ideal? What mistake is the researcher making?

Explanation / Answer

This experiment is not blind. Therefore, people who are not given any treatment know that they are not given any drug. This leads Experimenter bias. Experimenter bias is most likely to be a factor when the experimenter has an idea about how he or she would like the results to turn out or when there is a risk for subjective interpretation of the results.

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