A researcher wishes to​ estimate, with 95​% ​confidence, thepopulation proportion of adults who think the president of theircountry can control the price of gasoline. Her estimate must beaccurate within 44​% of the true proportion.
​a) No preliminary estimate is available. Find the minimumsample size needed.
​b) Find the minimum sample size​ needed, using a prior studythat found that
46​% of the respondents said they think their president cancontrol the price of gasoline.
​c) Compare the results from parts​ (a) and​ (b).
