traducction: Based on the EWMA laboratory, to reach a certain ARL in control you 1. need to vary: a) Lambda b) Lambda and L c) only L, d) None of the above Where the control limits of for a random variable (O) can be written as. E (Q) ± LVar (Q)   It can be said that phase I in a multivariate control chart concludes when. a) The parameters Y (û) and Ê of all the m samples of size n of the p variables are calculated. b) The parameters Y (u) and Ê are calculated with all m samples in control. c) When the points are plotted. d) None of the above

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