Question: Using 3-sigma control limits, compared to 2-sigma control limits, _____ the probability of Type I error (Type 1 error: When you say there is an

Using 3-sigma control limits, compared to 2-sigma control limits, _____ the probability of Type I error (Type 1 error: When you say there is an assignable cause though none exists, and the process is actually still in statistical control)

a.makes no difference to the type 1 error probability

b.reduce type 2 error

c.decrese

d.increase

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