A Design Engineer Wants to Construct a Sample Mean Chart

question 81

Multiple Choice

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that when this service life is in control it is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results

What is the mean of the sampling distribution of sample means when the service life is in control?

• A)250 hours
• B)470 hours
• C)495 hours
• D)500 hours
• E)515 hours

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Definitions:

Finished Goods

Products that have completed the manufacturing process and are ready to be sold to customers.

Materials

Refers to the raw inputs or supplies used in the manufacturing or production of goods.

Generally Accepted Accounting Principles

A set of rules and standards used by accountants to prepare, present, and report financial statements for companies and organizations.

Factory Overhead Rate

The method of allocating indirect costs to produced goods, usually calculated by dividing total factory overhead costs by a base such as direct labor hours or machine hours.