Question: When installing a bath faucet, it is important to properly fasten the threaded end of the faucet stem to the watersupply line. The threaded stem

When installing a bath faucet, it is important to properly fasten the threaded end of the faucet stem to the watersupply 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:

20 976982008565 999980909090 9919 x-12 2 3 2 3 3 2 2 2 2 2 32323232332322 265600658687954080 3 990990909999900081 x' | 2 2 3 2 2 3 2 3 2 2 2 22333233222232 5086786200586464265092008 1 0 9 9 8 9 0 1 0 0 99999000990098 X-2332222333322222333223322 607456060869582687 2 1-00 3 999009990899000999009 3. 3 3 3 2 2 2 3 3 2 2 23222333222332 ro-123456789012345678901

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