Multiple Choice
The usefulness of epidemiological studies are limited because
A) the sample of people exposed to high levels of toxic chemicals is usually too small to detect statistically significant differences.
B) people are exposed to many different chemicals throughout their lifetimes.
C) we cannot use epidemiological studies to study future hazards.
D) the studies take a long time.
E) all of these answers.
Correct Answer:

Verified
Correct Answer:
Verified
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