500 voters are randomly selected and asked whether they planned to vote for the Democratic incumbent or the Republican challenger. Of the 500 surveyed, 350 said they would vote for the Democratic incumbent. Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent?
Answer
a.0.647 and 0.753
b.0.612 and 0.712
c. 0.397 and 0.797
d. 0.826 and 0.926