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Thomas is going to conduct an experiment to test a new caffeinated milkshake to see if people feel more energized after they drink it. Some subjects
will have the actual new caffeinated milkshake while others will have a plain milkshake with no caffeine added. Thomas will have them perform
several exercises after they consume the milkshakes, and he will then interview them about their energy levels. Why is it important that this be a
double-blind experiment?

A.The subjects will be blindfolded so they cannot see which beverage they are drinking.

B.Thomas will not be able to influence the subjects' answers during the interview.

C.There is no possible bias because the names of the milkshakes are hidden from the subjects.

D.It will be very difficult for the subjects to complete exercises after drinking milkshakes.

Sagot :

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