Question: A design engineer wants to construct a mean chart for controlling the service life of a halogen headlamp his company produces. He tested service life

A design engineer wants to construct a mean chart

A design engineer wants to construct a mean chart for controlling the service life of a halogen headlamp his company produces. He tested service life on randomly picked three samples with four headlamps each, with these results: What are the X-bar chart upper and lower control limits? 507.17 and 482.83 507.3 and 492.7 505.15 and 484.05 529.6 and 500.4 512 and 478

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