Number of Trucks Sold Number of Weeks 20 1 15 10 3 4 1 O P{1 or 3 trucks sold} = 15/50 + 4/50 %3D O P{1 or 3 trucks sold} = 15/50 - 4/50 O P(1 or 3 trucks sold} = 15/50 + 10/ 50+ 4/50 O P{1 or 3 trucks sold} = 15/50 x 4/50 01

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.