Which of the following is not a characteristic of both surveys and

observational studies?

There are actually two answers for this question.

The first one is "The study compares two or more treatments (possibly including "no treatment"). "

The other one is "The study involves one or more treatment groups and a control group."

Step-by-step explanation:

I remember taking this quiz and I got most of the answers (including this one) c o r r e c t.