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Aresearcher wishes to estimate, with 95% condence, the population proportion of aduits who think Congress is doing a good or excellent job. Her estimate must be accurate within 3% 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 34% ofthe respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (h). E) (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 34% of the respondents said they think Congress is doing a good or excellent job? 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. 0 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