Consider the following statements about placebo studies. Which of them are right?

1.A patient's belief that he or she is receiving treatment can play an important role in recovery even if the treatment is ineffective

2.A placebo study involves two or three groups, depending on whether the researcher wants a control group

3.If a control group is used, one group receives the treatment, another receives the placebo, and the control group receives nothing

4.The decision about group allocation can be made through randomization

A1, 2 and 3

B2, 3 and 4

C1 and 3

DAll of the above ✓ Correct

Correct answer: (D) All of the above

Explanation

All four statements about placebo studies are correct.

Belief in receiving treatment can aid recovery even when the treatment is inert.

A placebo study uses two or three groups depending on whether a control is wanted.

With a control, one group gets treatment, one the placebo and one nothing.

Group allocation can be decided through randomization.

The placebo effect shows the mind's influence on physical outcomes.

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