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 402356 2590420.qx32qy? Jump to level 1 In a poll of 1000 randomly selected voters in a local election, 778 voters were in favor of fire department bond measures. What is the sample proportion p? Ex: 0. 123 + What is the margin of error m for the 90% confidence level? Ex: 0. 123