Grafico de control de medias y desviaciones estandar

Datos:

Grafico de control:

 

 Identificacion de las Nelson Rules

Nelson rule one: One point is more than 3 standard desviationd from the mean

Nelson rule two:  Nine (or more) points in a row are on the same side of the mean

Enlace documento excel:

https://drive.google.com/open?id=0B6URAfF0adKJYjMyZWVXa3k5M0k