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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.
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- BiasThe 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, averageA variables control chart used to evaluate the process level in terms of subgroup averages.
- Control chart, trendA 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 variationThe 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 inspectionIn 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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