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De dos poblaciones se tomaron muestras aleatorias independientes y se obtuvieron los siguientes resultados: muestra n x S ^2 1 36 1.24 0.056 2 45

De dos poblaciones se tomaron muestras aleatorias independientes y se obtuvieron los siguientes resultados:

muestra n x S ^2
1 36 1.24 0.056
2 45 1.31 0.054

a) Encuentre un intervalo de confianza para 1 - 2 con nivel 90%.

b) Con una significancia de 5% realice una prueba para determinar si la evidencia de las muestras es suficiente para afirmar que las medias poblacionales son diferentes

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