In quality control, statistical process control (SPC ) is oftenemployed to analyze the process capability in manufacturing orservice operations. Explain the following with an example each:
- What is a p chart  ?
- What is a c chart ?
There are 3 machines in your factory which can produce a ruler.The rulers as produced has a spread in length between 12.5 thru12.4 inch.
Given the standard deviation of the 3 machines are as follows,calculate the process capability of each machine. Which of the 3machines has the best process capability index ?
