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Confidence level Critical value 0.90 z=1.645 0.95 z= 1.960 0.99 z=2.576 A poll for a statewide election has a margin of error of 1.95 percentage

Confidence level Critical value

0.90 z=1.645

0.95 z= 1.960

0.99 z=2.576

A poll for a statewide election has a margin of error of 1.95

percentage points.

How many voters should be sampled for a 90%

confidence interval? Round up to the nearest whole number.

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