Process capability (Cp / Cpk)
Can the process meet its limits? See the spread against the specification, and how much is expected outside it.
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STEP 1
Your measurements, in time order
Keep them in the order they were made: the short-term spread is worked out from one value to the next. At least 25 values; 50 or more is better; up to 1,000. 0 values read.
STEP 2
The limits
One limit is enough, for example a maximum time with no minimum.
Capability means something only for a stable process. Check the control chart first: points out of control make these figures unreliable.