Answer
The center from which the sample is drawn has a high probability that most of the individuals will be married and might have children also, which in turn increases the probability of the individuals to undergo sex less often. So, the bias exists due to the sample considered; that is, sampling bias might be present in the data.
Work Step by Step
Sampling bias occurs when there is under coverage of the population or the sample under consideration focuses on one particular section of the population over another.
