The results of inspection of DNA samples taken over the past 10 days are given below. Sample size is 100.
Days: 1 2 3 4 5 6 7 8 9 10
Defectives: 7 6 6 9 5 6 0 8 9 1
a) Construct a 3-sigma p-chart using this information
b) If the number of defectives on the next three days are 12, 5 and 13, is the process in control?