increasing the sample size of an opinion poll will reduce the responses bias of the estimates made from the data collected in the poll. bias of the estimates made from the data collected in the poll. variability of the estimates made from the data collected in the poll. variability of the estimates made from the data collected in the poll. effect of nonresponse on the poll. effect of nonresponse on the poll. variability of opinions in the sample. variability of opinions in the sample. variability of opinions in the population.