Confidence level | Critical value 0.90 2* = 1.645 0.95 2* = 1.960 0.99 2 ' 2.576 404510.2603884.qx3zqy7 Jump to level 1 A poll reported 53% support for a statewide election with a margin of error of 3.39 percentage points. How many voters should be sampled for a 99% confidence interval? Round up to the nearest whole number. Ex: 1234 4 voters