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 Jump to level 1 In a poll of 1000 randomly selected voters in a local election, 337 voters were W N O - O in favor of fire department bond measures. What is the sample proportion p? Ex: 0.1234 4 What is the margin of error m for the 99% confidence level? Ex: 0.123 2 4 Check Next