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The correct expression for UCL for construction of a control chart is given by _____

Posted: Thu Jul 14, 2022 1:47 pm
by answerhappygod
a) UCL = \(\overline{x} + Z_{\frac{\alpha}{2}} (\sigma_x)\)
b) UCL = \(\overline{x} – Z_{\frac{\alpha}{2}} (\sigma)\)
c) UCL = \(\overline{x} – Z_{\frac{\alpha}{2}} (\sigma_x)\)
d) UCL = \(\overline{x} + Z_{\frac{\alpha}{2}} (\sigma)\)