Question

Which of the following is an example of control ?

A) Performing five different studies of the same drug
B) Repeating a study 10 times
C) Studying the effects of both therapy and no therapy on students
D) Assigning fest subjects to test groups arbitrarily

Answer 1

it’s d just did the quiz the above is no smart

Explanation:

Answer 2

C) Studying the effects of both therapy and no therapy on students

Explanation: