cartergardner45 cartergardner45

24-10-2022
Biology

Answered

An epidemiologist wants to figure out if the Flu vaccine is effective at lowering the likelihood of dying from the disease.

What are some controlled variables?

A

The death rate of unvaccinated individuals will be higher than vaccinated individuals.

B

The vaccine

C

The death rate

D

Age and pre-existing conditions

Answer :

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