Question
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 2.68 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 2.68
percentage points.
How many voters should be sampled for a 95%
confidence interval? Round up to the nearest whole number.
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