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Critical values for quick reference during this activity. Confidence level | Critical value 0.90 2* = 1.645 0.95 2* = 1.960 0.99 Z * = 2.576 Jump to level 1 1 In a poll of 1000 randomly selected voters in a local election, 187 voters were 2 in favor of school bond measures. 3 What is the sample proportion p? Ex: 0. 1232 4 What is the margin of error m for the 95% confidence level? Ex: 0.123~