Aresearcher wishes to estimate, with 90% confidence the population proportion of adults who think Congress in doing a good or excelent: Her estimate must be accurals within 2 of the true proportion (a) No preliminary estimat is available. Find the minimum sample size needed b) Find the minimum samler needed, using prior study that found that 22% of the respondents said they think Congress doing a good or Bronto Corror results from an and ta) What is the minimum amples reedeng talco por information is available? (Round up to the nearest whole nended)