Lazy B Ranch produces leather hides for use in the furniture and automotive upholstery industry. The company has taken 10 samples of nine observations each, measuring the square footage of each hide. Summary data are as follows:

Use these data to set up control limits for the hides. Why would it be important for the Lazy B Ranch to track this information? Why might it be harder for the Lazy B Ranch to reduce process variability than it would be for a more typical “manufacturer”?

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MEAN (SQ. FT.) (n = 9) MINIMUM MAXIMUM 13.2 12.7 13.5 12.8 12.5 13.3 12.6 13.7 13.3 13.1 12.5 13.5 12.7 12.2 13.0 12.9 12.5 13.3 13.2 12.9 13.5 13.0 12.6 13.6 13.1 12.7 13.4 12.7 12.3 13.5