Compute the process capability ratio

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Reference no: EM133141445

Question - Sam's Long Life 60-watt light bulbs are designed to have a life of 1,350 hours with tolerance of ± 340 hours. A recent representative sample from the process that makes these light bulbs revealed a mean of 1,290 hours, with a standard deviation of 94 hours. Compute

Required -

1. Compute the process capability ratio and the process capability index, and comment on the overall capability of the process

2. Explain to what extent the process for producing Sam's Long Life 60-watt light bulbs would have to be improved to achieve 4-sigma quality.

Reference no: EM133141445

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