Feedback? CHALLENGE ACTIVITY 4.8.1: Confidence intervals for population proportions. Critical values for quick reference during this activity. Confidence level Critical value 0.90 2* = 1.645 0.95 2* = 1.960 0.99 2* = 2.576 402216.1927122.qx3zqy7 V Jump to level 1 v A poll reported 36% support for a statewide election with a margin of error of 2 3.55 percentage points. How many voters should be sampled for a 95% confidence interval? Round up to the nearest whole number. Ex: 1234 voters 2 3 Check Next