Control Charts: Jean Auel was recently appointed controller for a medium-sized manufacturing firm. Her first assignment is to investigate whether material usage within the plant is under control. She recalls studying statistical quality control techniques in a management education course and decided to apply it to her investigation. She took the following two samples:

Required: The control limits specified are 

a. Prepare a control chart using the designated control limits.

b. Comment on the results.

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Sample Number 1 2 +2 Cost of Each Item $945 $876 $852 $941 822 943 949 782