The Gallup Poll has decided to increase the size of its random sample of voters from about 1500 people to about 4000 people right before an election. The poll is designed to estimate the proportion of voters who favor a new law banning smoking in public buildings. The effect of this increase is to:.a. reduce the variability of the estimate.
b. have no effect since the population size is the same.
c. increase the variability of the estimate.
d. reduce the bias of the estimate.
e. increase the bias of the estimate