Many people think that a national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A previous random sample of 4000 citizens yielded 2250 who are in favor of gun control legislation. How many citizens would need to be sampled if a 90% confidence interval was desired to estimate the true proportion to within 5%?
Which of these four numbers is the answer?|||n = ( Z/E)^2(pq) = ( 1.645 / .05 )^2 ( 0.246 ) = 266.37
minimum sample size is 267