7.2: Confidence intervals for population proportions Critical values for quick reference during this activity. Confidence level Critical value 0.90 2* = 1.645 0.95 z* = 1.960 0.99 2* = 2.576 376960.2353960.qx3zgy7 Jump to level 1 In a poll of 1000 randomly selected voters in a local election, 665 voters were in favor of fire department bond measures. What is the sample proportion p? Ex: 0.123 9 What is the margin of error m for the 90% confidence level? |Ex: 0.123 2 4 Check Next Feedback