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
The EWMA charts are constructed by plotting _______________ versus the sample number i or the time.
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answerhappygod
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The EWMA charts are constructed by plotting _______________ versus the sample number i or the time.
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