Determine whether the sampling method described below appear

Determine whether the sampling method described below appears to be sound or is flawed. In a survey of 638 subjects, each was asked how often he or she drank milk.drank milk. The survey subjects were internet users who responded to a question that was posted on a news website.

A. It appears to be sound because the data are not biased in any way.

B. It is flawed because it is a voluntary response sample.

C. It is flawed because it is not statistically significant.

D. It is flawed because it is a census.

Solution

It seems to be flawed. Because responses are voluntary.

Here users should be selected at random and all should give responses, then it will be a sound sampling method.

So option B is correct.