A Design Engineer Wants to Construct a Sample Mean Chart

question 66

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 sample mean service life for sample 2?

• A)470 hours
• B)495 hours
• C)500 hours
• D)515 hours
• E)525 hours

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Definitions:

Classical Conditioning

A learning strategy that consists of continuously pairing two stimuli; the reaction that is at the beginning evoked by the second stimulus, is eventually evoked by the first stimulus singularly.

Negative Reinforcement

A process in behavior modification where the removal of an undesirable or unpleasant stimulus strengthens or increases the likelihood of a behavior.

Spontaneous Recovery

The reappearance of a conditioned response after a period of lessened response.

Operant Conditioning

A technique for adjusting behavior by dispensing rewards for good actions or penalties for bad ones.