A Pollster Wishes to Estimate the True Proportion of Voters

Multiple Choice

A pollster wishes to estimate the true proportion of voters in Ottawa,Ontario,who support the Conservative party.How many voters should be surveyed in order to be 95% confident that the true proportion is estimated to within 4%?

A) 846
B) 1037
C) 423
D) 601
E) Not enough information is given.