1.

The correct expression for UCL for construction of a control chart is given by _____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}} (\sigm

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 = \(\overline{x} + Z_{\frac{\alpha}{2}} (\sigma)\)
Answer» B. UCL = \(\overline{x} – Z_{\frac{\alpha}{2}} (\sigma)\)


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