Question: Math 240 ities CHALLENGE ACTIVITY 7.2.1: Confidence intervals for population proportions Critical values for quick reference during this activity. Confidence level Critical value 0.90 2

Math 240

ities CHALLENGE ACTIVITY 7.2.1: Confidence intervals for population proportions Critical values for quick reference during this activity. Confidence level Critical value 0.90 2 - 1.645 0.95 2* = 1.960 0.99 z - 2.576 V Jump to level 1 V A poll reported 34% support for a statewide election with a margin of error of 2 4.45 percentage points How many voters should be sampled for a 99%% confidence interval? Round up to the nearest whole number Ex: 1234 voters

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