The EWMA charts are constructed by plotting _______________ versus th – McqOptions

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1.	The EWMA charts are constructed by plotting _______________ versus the sample number i or the time.
A.	The sample observation, xi
B.	The sample variance, σ2
C.	The variance of variable zi i.e. \(\sigma_{z_i}^2\)
D.	The variable zi
Answer» E.

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