A researcher wishes to estimate, with 99% confidence, the population proportion of adults who support labeling legislation for genetically modied organisms {GMOs}. Her estimate must be accurate within 5% of the true proportion. {a} No preliminary estimate is available. Find the minimum sample size needed. {b} Find the minimum sample size needed, using a prior study that found that 68% of the respondents said they support labeling legislation for GMOs. (cl Compare the results from parts {a} and {b}. (a) What is the minimum sample size needed assuming that no prior information is available? n = D (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 68% of the respondents support labeling legislation? n = D (Round up to the nearest whole number as needed.) {c} How do the results from (a) and (b) compare? 0 A. Having an estimate of the population proportion raises the minimum sample size needed. O B. Having an estimate of the population proportion has no effect on the minimum sample size needed. 0 C. Having an estimate of the population proportion reduces the minimum sample size needed