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

question 134

True/False

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.
-True or False: Referring to Table 8-2,the confidence interval is valid only if the lengths cut are normally distributed.

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Definitions:

Gross Profit

Gross profit is the revenue from sales minus the cost of goods sold, indicating the profitability of a company's core business activities excluding overhead costs.

Inventory Records

Documentation that tracks the quantity, value, and movement of products or materials a company holds in stock.

FIFO Periodic

An inventory valuation method where goods first purchased or produced are also the first to be sold, assessed periodically at the end of an accounting period.

Beginning Inventory

The value of a company's inventory at the start of an accounting period, used in calculating cost of goods sold during the period.