Please answer all parts

A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 1% 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 44% of the respondents said they think Congress is doing a good or excellent job. (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.)