A Design Engineer Wants to Construct a Sample Mean Chart

question 26

Multiple Choice

A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs his company produces.He knows from numerous previous samples that this service life 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 bulbs,with these results: What is the standard deviation of the sampling distribution of sample means?

• A)5 hours
• B)6.67 hours
• C)10 hours
• D)11.55 hours
• E)20 hours

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Definitions:

Expected Dividend Yield

An estimation of the dividend earnings on a stock investment, expressed as a percentage of the stock price.

Expected Dividend

The forecasted amount of dividend payments that an investor anticipates receiving from investments in stocks.

Tracking Stock

A type of stock issued by a parent company that tracks the financial performance of a particular division or subsidiary without conferring ownership.

Dual-Class Shares

Dual-class shares are a type of stock structure where different classes of shares provide different rights, typically voting power, to shareholders.