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BRAINLYEST QUESTION A drug company performed a study to test the effectiveness of a new headache medicine. The researchers grouped the patients into two different groups. One group was given the pills that contained the new medicine. The other group were given pills that did NOT contain the new medicine. Why did the researchers NOT tell the patients which pill they were given?
A) to make sure they didn't get angry
B) to prevent errors in data collection
C) to keep people from leaving the study
D) to prevent bias in the data collection

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Answer:

D) to prevent bias in the data collection

Explanation:

If the researchers told the patients of the pill they took, it could create bias.

Bias can make the experiment's outcome end in a different way because of the way it influences the people taking the pill.

Bias can create another factor in an experiment, making your results unreasonable due to the addition of another factor.

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