In: Statistics and Probability
If we define a convenient unit (convenient unit for monitoring chart) = 100 boards and the sample size is n = 2.5.
(a) How many boards should be checked at each sampling time?
(b) Assume in control Phase I data, we found 50 defects in 1000 boards, what are the estimated ?0 and ?0?
(c) What are the CL, UCL/LCL for the c and u charts based on (b)?
(d) If at the sampling time t, 13 defects are found in a sample, what is the monitoring statistic value to be plotted in the c chart and u chart?
(e) Continue (d), which monitoring statistic follows the Poisson distribution? What is the Poisson distribution parameter?