A Design Engineer Wants to Construct a Sample Mean Chart

question 15

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 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 headlamps, with these results

What is the standard deviation of the sampling distribution of sample means for whenever service life is in control?

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

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