A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think the president of their country can control the price of gasoline. Her estimate must be accurate within 2% of the true proportion.

a) No preliminary estimate is available. whats the minimum sample size needed.

b) whats the minimum sample size needed, using a prior study that found that 46% of therespondents said they think their president can control the price of gasoline.