Question: Suppose that a process with a normally distributed output has a mean of 55 and a variance of 4. If the specifications are 55.0 4.00,

Suppose that a process with a normally distributed output has a mean of 55 and a variance of 4.

If the specifications are 55.0 4.00, compute Cp and Cpk (both Cpu and Cpl).

Suppose the mean shifts to 53.0 but the variance remains unchanged. Recompute and interpret these process capability indices.

If the variance can be reduced to 40% of its original value, how do the process capability indices change (using the original mean of 55)? What can be done to have the process run at six sigma level?

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