The EWMA charts are constructed by plotting _______________ versus the – 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, x<sub>i</sub>
B.	The sample variance, <sup>2</sup>
C.	The variance of variable z<sub>i</sub> i.e. ( sigma_{z_i}^2 )
D.	The variable z<sub>i</sub>
Answer» E.

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