Critical values for quick reference during this activity.

Confidence level	Critical value
0.90	z=1.645
0.95	z=1.960
0.99	z=2.576

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In a poll of 1000 randomly selected voters in a local election, 90 voters were against fire department bond measures. What is the sample proportion p^? What is the margin of error m for the 99% confidence level?

What is the margin of error m for 95% confidence level?