Question

3 select the correct answer from each drop - down menu. a group of doctors are conducting an experiment to test a new nutritional supplement. they randomly selected 600 subjects, assigning 300 subjects to receive the supplement and 300 subjects to receive a placebo. the doctors are unaware of which subjects are assigned to each treatment group. this experiment is drop - down 1 because drop - down 2 know which treatment group each subject is in.

Explanation:

In a single - blind experiment, either the participants or the researchers are unaware of who is in the treatment or control group. Here, the doctors (researchers) are unaware of which subjects are in each treatment group.

Answer:

First drop - down: single - blind
Second drop - down: the doctors