What is the value of Zi in the standardized control chart for u-chart with variable sample size?
Posted: Thu Jul 14, 2022 1:53 pm
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) \(\frac{u_i-\bar{u}}{\sqrt{\frac{\bar{u}}{\bar{n}}}}\)
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) \(\frac{u_i-\bar{u}}{\sqrt{\frac{\bar{u}}{\bar{n}}}}\)