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 1 In a poll of 1000 randomly selected voters in a local election, 591 voters were 2 in favor of school bond measures. 3 What is the 90% confidence interval? [ Ex: 0.123 Ex: 0. 123 [smaller value, larger value] 4 2 3 4 Check Next