Which of the following study designs requires that treatment be applied to test subjects?

Question

Option #1: observational studies

Option #2: experimental studies

Option #3: surveys

A
Option #1

B
Option #2

C
Option #3

Answer 1

B Option #2: experimental studies

Experimental studies require that a treatment or intervention be applied to test subjects to evaluate the effects of that treatment. Observational studies and surveys do not involve applying treatments; instead, they involve observing and collecting data without manipulation by the researcher.