Question: Confidence Interval (C.I.) on difference between two proportions Treadmill p1 0.362162 Service contract sold q1 0.637838 Service contract NOT sold n1 185 Service contract 67

Confidence Interval (C.I.) on difference between two proportions Treadmill p1 0.362162 Service contract sold q1 0.637838 Service contract NOT sold n1 185 Service contract 67 zc 1.96 sigma(p1) 0.069259 0.2929030558 <= Exercise Bike p2 0.447154 q2 0.552846 n2 123 95% Confidence Level p1 Sigma(p1-p2) Proportion difference Confidence Interval <= 0.111883 -0.084992 Min -0.196875 0.431421 max 0.02689 Service contract 55 zc 1.96 sigma(p2) 0.087869 0.3592857707 <= Service contract sold Service contract NOT sold p2 <= 0.535023

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