STATS FRQ 1 Prop Z Test Given: one sample proportion or percent is testing against a claimed population proportion/percent Ho: P=? Ha: P<? || P>? || p!=? Conditions: random normal [np>=10 && n(1-p)>=10] 10% Calculations: Z=(obs-mean)/sd sd=σp̂ = sqrt[ P * ( 1 - P ) / n ] 1 Prop Z Int Given: 1 sample proportion or percent and might e given a claimed proportion or percent Ho: P=? Ha: P<? || P>? || p!=? Conditions: Random normal [np>=10 && n(1-p)>=10] 10% Calculations: (stats wizard off) CI = p̂ ± Z* SE(p̂) SE = sqrt[p̂ * ( 1 - p̂ ) / n ] Z*=invNorm(area||CI)
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