The bottling division of Sweet Suzy's Sugarless Cola maintains daily records of the occurrences of unacceptable cans flowing from the filling and sealing machine. The data in Colaspc lists the number of cans filled and the number of nonconforming cans for one month (based on a five-day workweek).
a. Construct a p chart for the proportion of unacceptable cans for the month. Does the process give an out-of control signal?
b. If you want to develop a process for reducing the proportion of unacceptable cans, how should you proceed?