. Suppose that there are p = 4 quality characteristics, and in correlation form all four variables have variance unity and all pairwise correlation coefficients are 0.75. The in-control value of the process mean vector is ((' = [0, 0, 0, 0], and we want to design an MEWMA control chart to provide good protection against a shift to a new mean vector of y' = [1, 1, 1, 1]. If an in-control ARL, of 200 is satisfactory, what value of A and what upper control limit should be used? Approximately, what is the ARL, for detecting the shift in the mean vector?