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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 70% 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 70%

support for a statewide election with a margin of error of 2.24

percentage points.

How many voters should be sampled for a 95%

confidence interval? Round up to the nearest whole number.

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