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

question 113

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

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Definitions:

Double-Entry Bookkeeping

An accounting system in which the recording of each transaction affects two or more accounts and the total of the debits is equal to the total of the credits.

Debiting

The process of recording an entry on the left side of the accounting ledger, which increases asset or expense accounts and decreases liability, equity, or revenue accounts.

Crediting

The process of making an entry on the right side of an account in double-entry bookkeeping, indicating an increase in liabilities, equity, or revenue, or a decrease in an asset or expense.

Salaries Payable

A liability account representing amounts owed to employees for work performed and not yet paid.