A researcher placed interviewers at multiple entrances and exits to a mall and asked them to interview a wide sample of mall visitors including parents, couples, and singles. In the process of verifying the responses, the researcher found that one interviewer only sampled mothers with children. The interviewer noted that only mothers with young children entered via his entrance. What kind of error has occurred here?

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The Answer of A researcher placed interviewers at multiple entrances and exits to a mall and asked them to interview a wide sample of mall visitors including parents, couples, and singles. In the process of verifying the responses, the researcher found that one interviewer only sampled mothers with children. The interviewer noted that only mothers with young children entered via his entrance. What kind of error has occurred here?

A Researcher Placed Interviewers at Multiple Entrances and Exits to a Mall