A random sample of size n = 500 is taken from a population with p = 0.34.

a. Construct the centerline and the upper and lower control limits for the chart.

b. Suppose six m ore sam ples of size 500 w ere drawn, producing th e following sam ple proportions: 0.2 8 , 0.30, 0 .3 3 , 0 .3 4 , 0.37, and 0.39. Plot th ese values on th e chart.

c. Are any points outside the control limits? Does it appear that the process is under control? Explain. L056