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Si las proporciones de dos muestras son, P1 = 0.20 y P2 = 0.40 ,si se tienen los tamanos n1 = 1400 y n2 =

Si las proporciones de dos muestras son, P1 = 0.20 y P2 = 0.40 ,si se tienen los tamanos n1 = 1400 y n2 = 1000 `calcule el valor z que le corresponde. O a. -21.05 O b. -1.56 O C. 0.20 O d. -10.63

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