Sam's Long Life 75-watt light bulbs are designed to have a life of 1,100 hours with tolerances of 215 hours. The process that makes light bulbs has a mean of 1,000 hours, with a standard deviation of 51 hours. Compute the process capability ratio and the process capability index, and comment on the overall capability of the process.
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Process Capability Index:
Process capability index or process capability ratio is the ability of a process to produce goods and services with the required specification. Is concept it is applied only to the processes where the manufacturing process is in a state of statistical control.
Answer and Explanation:
Compute the process capability ratio and the process capability index by the following way.
USL = 1,100 + 215
USL = 1,315
LSL = 1,100 - 215
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fromChapter 4 / Lesson 5