Areseareher wishes to estimate. with 99% condence, the population proportion of adults who say diocoiate is their favorite ice cream avor. Her estimate must be accurate within 3% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sampie size needed, using a prior study that found that 28% of the respondent: said their Favorite avor ofice cream is chocolate. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n = (Round up to the nearest whole number as needed.) {b} What is the minimum sample size needed using a prior study that found that 23% ot the respondents said their favorite ice cream avor is chocolate? n = (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare? 0 A. Having an estimate ofthe population proportion raises the minimum sample size needed. 0 B. Having an estimate ofthe population proportion has no effect on the minimum sample size needed. 0 0. Having an estimate ofthe population proportion reduces the minimum sample size needed