Homework Answers
a.
It is an observational study.
Observational studies are ones where researchers observe the effect of a risk factor, diagnostic test, treatment or other intervention without trying to change who is or isn't.
And Experimental studies rely on the detection of the effects on an intervention.In experimental study we have check effect of study i.e. we have effect group and placebo group.we got to know the effect of method.
Here we only get opinion of peoples.so it is observational.
b)
American peoples.
C)
2000 American People.
D) 16 % is a statistic because it belongs to sample.
statistic
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