Question 1166657
half-interval is z(0.995)*sqrt(p*(1-p)/n) use p=0.5 as the most conservative estimate. z=2.576
half-interval is 2.576 * sqrt (.25)/n and that equals 0.03
square both sides and 0.0009=6.634*.25/n
so 0.0009n=1.6585
n=1842.77 or 1843