ge 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 377568.2350564.gxEng/7 Jump to level 1 In a poll of 1000 randomly selected voters in a local election, 642 voters were against school bond measures. What is the 90% confidence interval? [ Ex: 0.12: $ . Ex: 0.12: $ ] [smaller value, larger value] 2 4 Check Next