Challenge activities CHALLENGE ACTIVITY 7.2.1: 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 377108.2356942.qx3zqy7 V Jump to level 1 1 In a poll of 1000 randomly selected voters in a local election, 352 voters were 2 in favor of fire department bond measures. 3 What is the 90% confidence interval? [ Ex: 0.123 , Ex: 0.123 [smaller value, larger value] 4 2 13 Check Next Feedback