1. In quality control. Statistical Process Control (SPC) is often employed to analyze the process

Capability in manufacturing or service operations. Explain the following with an example each:

• What is a p chart?
• What is a c chart ?

2.There are 3 machines in your factory which can produce a rectangular table top. The lengths of

the table tops as produced by the 3 machines fall within an acceptable tolerance range of 48.4

inch thru 48.6 inch. ( 48.5 + / - 0.1 inch ).

Given the standard deviation of the 3 machines are 0.20, 0.21 and 0.22 respectively, Calculate the

process capability of each machine. Which of the three machines has the best process capability

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