1.

What is the value of Zi in the standardized control chart for u-chart with variable sample size?

A. ( frac{u_i+ bar{u}}{ sqrt{ frac{ bar{u}}{ bar{n}}}} )
B. ( frac{u_i+ bar{u}}{ sqrt{ frac{ bar{u}}{n_i}}} )
C. ( frac{u_i- bar{u}}{ sqrt{ frac{ bar{u}}{n_i}}} )
D. ( frac{u_i- bar{u}}{ sqrt{ frac{ bar{u}}{ bar{n}}}} )
Answer» D. ( frac{u_i- bar{u}}{ sqrt{ frac{ bar{u}}{ bar{n}}}} )


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