Average

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Categories: Terms

A measure of central tendency determined by the sum of the values divided by the number of values. When calculated on a sample of items it is an estimate of the population mean.

Bias
The difference between the observed average of measurements (trials under repeatability conditions) and a reference value; historically referred to as accuracy. Bias is evaluated and expressed at a single point within the operating range of the measurement system.
Control chart, average
A variables control chart used to evaluate the process level in terms of subgroup averages.
Control chart, trend
A control chart used to evaluate the process level with respect to the deviation of the sub-group averages from an expected change in the process level.
Appraiser variation
The variation in average measurements of the same part (measurand) between different appraisers (operators) using the same measuring instrument and method in a stable environment.
Average amount of inspection
In acceptance sampling, the expected number of items to be inspected per lot for a given acceptance sampling scheme with a goal to reach a decision for a certain average lot quality level.

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