Question

Ravi is a participant in a cognitive experiment, but he does not know if he is in the experimental group or the control group. The researchers, however, are aware of the condition to which he has been assigned. The study in which Ravi is participating is called a what?

a) Single-blind study
b) Double-blind study
c) Open-label study
d) Placebo-controlled study

Answer 1

Ravi is involved in a single-blind study, where he does not know his group assignment, but the researchers do, to prevent placebo effects and control bias.

Step-by-step explanation:

Ravi is a participant in a cognitive experiment but is unaware of whether he is in the experimental group or the control group, while the researchers do know this information. The study Ravi is participating in is called a single-blind study. This is because the term "single-blind" refers to the situation in which only one party, in this case, the participants, do not have information about the group assignments. The researchers, however, are fully aware of who has been placed in which group. This is important to prevent the placebo effect and control for biases that could affect the outcome of the study.