Why is it important that you make a concerted effort to complete a survey with each of the respondents selected for inclusion in a sample?

What will be an ideal response?

Substituting for a respondent who refuses to complete a survey may bias results of the survey if there is some common factor shared by those who refuse to cooperate. The amount of bias introduced by nonresponses due to refusal or unavailability varies, depending on the purpose of the study and the explanatory factors stressed by the research.