A process is monitored for defective items by taking a sample of 200 items each day and calculating the proportion that are defective. Let pi be the proportion of defective items in the ith sample. For the last 30 samples, the sum of the proportions is

Calculate the center line and the 3σ upper and lower control limits for a p chart.

Transcribed Image Text:

Σ301 Pi = 1.64 30 pi = 1.64