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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 Jump to level 1 In a poll of 1000 randomly selected voters in a local election, 889 voters were in favor of fire department bond measures. What is the sample proportion p? 0.889 What is the margin of error m for the 95% confidence level? Ex: 0.123 1 3 Check Next Feedback? CHALLENGE ACTIVITY 7.2.2: Confidence intervals for population proportions (two-tailed). MacBook Air esc