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Critical values for quick reference during this activity. Confidence level Critical value 0.90 2* = 1.645 0.95 2 = 1.960 0.99 2* = 2.576 Jump to level 1 V A poll reported 32% support for a statewide election with a margin of error of 2.36 percentage points. 3 How many voters should be sampled for a 90% confidence interval? Round up to the nearest whole number. Ex: 1234 $ voters