Vol. 5, No. 11
is puzzled. LaMal and her sister Aqua d’Mer own and operate a
plastics extrusion plant near the sea. The company, Synk R Swym, makes
decorative items with an ocean theme. Some of these are clear plastic
bubbles, molded plastic shells, and fish ornaments. Customers of the
company, founded by their father Neptune d’Mer, are primarily
retailers from the Midwest and large cruise ship companies who buy products
for their passengers.
as noted, is puzzled. A technician has been keeping data and creating
X-bar and R charts to analyze the rods’ dimension. The sample
size used is 5, but from time to time the sample size is slightly smaller.
LaMal is trying to determine why control limits change on the chart
when the sample size is smaller, becoming wider as sample size drops.
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