considere los datos de fuerza de la tencion de adesion del experimento de la formulacion del cemento portland. construya un intervalo de confianza del 95% para la diferencia de medias.

cement1 <- c(14, 12, 11, 10, 9, 8, 8, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2)
cement2 <- c(20, 18, 13, 12, 12, 12, 11, 9, 9, 8)

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