You are attempting to develop a quality monitoring system for some parts purchas

Question

You are attempting to develop a quality monitoring system for some parts purchased from Charles Sox Manufacturing Co. These parts are either good or defective. You have decided to take a sample of 50 units. Develop a table of the appropriate upper and lower control chart limits for various values of the average fraction defective in the samples taken. The values forp in this table should range from 0.01 to 0.09 in increments of 0.02. Enter the upper and lower control limits for a 99.73% confidence level in the table below (enter your responses as numbers between 0 and 1, rounded to three decimal places).

Explanation / Answer

z = 3 @ 99.73 % confidence level

n =50 P bar UCL = pbar + (3*(Sqrt(pbar(1 - pbar))/n)) LCL = pbar - (3*(Sqrt(pbar(1 - pbar))/n)) 0.01 0.052 -0.0322 0.03 0.102 -0.0424 0.05 0.142 -0.0425 0.07 0.178 -0.0382 0.09 0.211 -0.0314

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