O Menu Zy Section 7.2 - MAT 240: App X Course Hero x + Q X MAT 240: Applied Statistics home > 7.2: Confidence intervals for population proportions zyBooks catalog Help/FAQ CHALLENGE ACTIVITY 7.2.1: Confidence intervals for population proportions. Critical values for quick reference during this activity. Confidence level | Critical value 0.90 z* = 1.645 0.95 2* = 1.960 0.99 2* = 2.576 387962.2528628.qx3zqy7 Jump to level 1 A poll for a statewide election has a margin of error of 4.79 percentage points. - W { N