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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 reported 31% support for a statewide election with a margin of error

Confidence level Critical value

0.90 z=1.645

0.95 z= 1.960

0.99 z=2.576

A poll reported 31%

support for a statewide election with a margin of error of 4.23

percentage points.

How many voters should be sampled for a 95%

confidence interval?

Round up to the nearest whole number.

voters

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