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TABLE 8-2
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired mean length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sample of 70 cut sheets yields a mean length of 12.14 feet. This sample will be used to obtain a 99% confidence interval for the mean length cut by machine.
-Referring to Table 8-2, the confidence interval is valid only if the lengths cut are normally distributed.
Primary Pollutant
A contaminant released directly into the atmosphere from identifiable sources, contributing directly to air pollution.
Coal
A combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams, used primarily as a source of energy.
Carbon Monoxide
A colorless, odorless, and poisonous gas produced by incomplete combustion of carbon-containing materials.
Ozone
A molecule made up of three oxygen atoms that occurs naturally in the Earth's stratosphere and protects life by absorbing ultraviolet radiation.
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