The EWMA charts are constructed by plotting _______________ versus the sample number i or the time.
Posted: Thu Jul 14, 2022 1:54 pm
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
b) The sample variance, σ2
c) The variance of variable zi i.e. \(\sigma_{z_i}^2\)
d) The variable zi