Concept explainers
When installing a bath faucet, it is important to properly fasten the threaded end of the faucet stem to the water-supply line. The threaded stem dimensions must meet product specifications, otherwise malfunction and leakage may occur. Authors of “Improving the Process Capability of a Boring Operation by the Application of Statistical Techniques” (Intl. J. Sci. Engr. Research, Vol. 3, Issue 5, May 2012) investigated the production process of a particular bath faucet manufactured in India. The article reported the threaded stem diameter (target value being 13 mm) of each faucet in 25 samples of size 4 as shown here: Calculate control limits based on using the sample
Calculate control limits based on using the sample ranges to estimate σ. Does the process appear to be in control?
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Probability and Statistics for Engineering and the Sciences
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