Long Last Tire Company, as part of its inspection process, tests its tires for tread wear under

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Long Last Tire Company, as part of its inspection process, tests its tires for tread wear under simulated road conditions. Twenty samples of three tires each were selected from different shifts over the last month of operation. The tread wear is reported  below in hundredths of an inch.

Tread Wear Tread Wear Sample Sample 1 44 41 19 11 11 33 34 2 39 31 21 12 51 34 39 30 38 16 25 13 30 16 4 20 33 26 14 22


a. Determine the control limits for the mean and the range.
b. Plot the control limits for the mean tread wear and the range.
c. Are there any points on the mean or the range chart that are €œout of control€? Comment on the chart.

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Statistical Techniques in Business and Economics

ISBN: 978-1259666360

17th edition

Authors: Douglas A. Lind, William G Marchal

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