A newspaper has decided to increase the size of its random sample from about 500 people to about 3000 people. The poll is designed to estimate the proportion of people that favor lowering the legal drinking age
from 21 to 18. The effect of this increase is to
(a) reduce the bias of the estimate.
(b) increase the bias of the estimate.
(c) reduce the variability of the estimate.
(d) increase the variability of the estimate
(e) reduce the bias and variability of the estimate.