User`s manual

and upper and lower limit values. To be acceptable, an item
must lie within the upper and lower specification limits.
Standard deviation - A measure of the variation or
dispersion in a process, usually based on the evaluation of a
sample (instead of the entire “population”) of units
produced by the process.
Subgroup - A sample of individual observations or results
of a specified size, upon which statistical operations are
performed. These include mean, range, and standard
deviation.
Target - The nominal or desired value of each item
produced by a process.
Tolerance - The acceptable variation in value from the
nominal or target value as designated by the upper and
lower specification limits.
UCL - The upper control limit (see Control limits).
USL - The upper specification limit (see Specification).
X double bar -The mean of the subgroup means.
X bar - The mean of the individual values (X) in a
subgroup. Ideally, the value of X bar should coincide with
the target value of the specification.
R-3