1. The difference between an experiment and an observational study is that A) ob

Question

1. The difference between an experiment and an observational study is that

A) observational studies don’t have explanatory and response variables.

B) experiments don’t have placebos.

C) an experiment imposes treatments on subjects, while an observational study accepts existing treatments.

D) experiments are double-blind, while observational studies are only single-blind.

E) All of the above

2. The type of design illustrated in the previous problem is

A) completely randomized design.

B) categorical variable

C) block design.

D) matched pairs design

E) multistage sample.

Explanation / Answer

A -false because observational studies have explanatory and response variables only

B - false because experiments have placebos.

C-true

D- false

E- fale

So option C  an experiment imposes treatments on subjects, while an observational study accepts existing treatments.

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