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Suppose you calculate “X bar bar” = 25 and “R bar” = 7.5 from 25 previous...

Suppose you calculate “X bar bar” = 25 and “R bar” = 7.5 from 25 previous samples of size 5 each. Assume the quality characteristic has a normal distribution and both the “X bar” and R charts show statistical control of the process. Specification limits are at 24 ± 7.

   c) Calculate the percentage of items outside the specification limits.

  d) Calculate the capability index. Comment on the capability of the process.

Math   Statistics-And-Probability   
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