A campaign researcher would like to estimate the proportion of registered voters that will vote for

his candidate. He runs a poll each week asking registered voters their candidate preference and

calculates a 95% confidence interval to estimate the true proportion of registered voters that will

vote for his candidate. On week 39 his confidence interval was (0.52, 0.56). On week 40 (the last

week of the campaign) he wants to conduct one final poll. He would like his 95% confidence

interval to have a margin of error of .01. Use the previous week's information to determine the

minimum sample size needed to achieve the researcher's goals for estimation.

(A) 96

(B) 9604

(C) 9543

(D) 11187

(E) 9589