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  1. ESTIMACION POR INTERVALO EN EL CASO DE MUESTRAS INDEPENDIENTES El interés es estimar la diferencia entre dos medias poblacionales µ1-µ2 . El metodo depenande de los tamaños de la muestra n1 y n2.

  2. ESTIMACION CON MUESTRAS GRANDES • La estimación puntual de la diferencia entre µ1- µ2 esta dada por la diferencia entre las dos medias muestrale . • En La distribution normal de las diferencias entre las medias muestrales utiliza la desviacion normal z para construir el intervalo.

  3. ERROR ESTANDAR DE LAS DIFERENCIAS ENTRE MEDIAS MUESTRALES

  4. VARIANZAS DESIGUALES

  5. a

  6. EJEMPLO

  7. b

  8. 1 1

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