Question

in a clinical trial for a new headache medication, participants are randomly assigned to a treatment group or a placebo group. they do not know whether they are receiving the medication or a placebo. the element of experiment design being used is
(1 point)
○ replication
○ randomization
○ blinding

Explanation:

Blinding is when participants (in single - blind) or both participants and researchers (in double - blind) do not know who is in the treatment or control group. Here, participants don't know if they get the medication or placebo, which is blinding.

Answer:

C. blinding