A graph can not overcome the deficiency of having a voluntary response sample.
The term voluntary response sample has to do with a situation in which the researcher decides to make participation in the research a matter of the volition of the subjects. The subjects are free to respond to the survey or not.
Often time, the voluntary response sample does not accurately reflect the reality on ground due to under coverage bias. Thus, a graph can not overcome the deficiency of having a voluntary response sample.
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