Apolling agency wants to determine the size of a random sample needed to estimate the percentage of voters a particular candidate will receive in the next election. the estimate should have a margin of error of no more than 2.2 percentage points at a 95% level of confidence. a. how large a sample should the agency take? b. would a 1% margin of error require a larger or smaller sample size than in part a? c. if the degree of confidence were lowered to 90%, with the margin of error no more than 2.2%, would that require a larger or smaller sample size than the result for part a?