Question

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



Option #1: observational studies

Option #2: experimental studies

Option #3: surveys

A
Option #1

B
Option #2

C
Option #3

Answer 1

The correct answer is:

B
Option #2: experimental studies

Experimental studies involve the application of treatments or interventions to test subjects to evaluate the effects of those treatments. Observational studies and surveys do not require treatment to be applied; they focus on observing and collecting data without manipulating conditions.