TABLE 8-2 A Quality Control Engineer Is Interested in the Mean Length

question 149

Short Answer

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 goes from ________ to ________.

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Definitions:

Direct Materials Price Variance

The variance between the real expense of direct materials utilized in production and their predetermined cost, multiplied by the real amount of materials used.

Pounds

A unit of weight commonly used in the United States' customary and British imperial measurement systems.

Overhead Cost Variance

The difference between the actual overhead incurred and the overhead that was expected or budgeted.

Management By Exception

A management strategy where leadership steps in only when performance deviates significantly from standards, focusing on the exceptions rather than routine operations.