Question 909172
a) ME = 1.645(sqrt( .6*.4/200) = .057 
CI = .6 - ME < p < .6 + ME
CI =.543 < p < .657
b).02 = 1.96 (.6*.4/n)
n = .24/(.02/1.96)^2 =  .24 / .0001 =  2400 Presidents