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A pictorial way to display data in frequency form. This provides a visual way to evaluate the form of the data.
A single unit or a single measurement of a characteristic.
The average of values in a group of measurements.
The middle value in a group of measurements, when arranged from lowest to highest (if the number of values is even). When the number of values is not even, by convention the average of the 2 middle values is the median.
Units which do not conform to a specification or other inspection standard. Sometimes called discrepant or defective units. p and np control charts are used to analyze systems producing nonconforming units.
Specific occurrences of a condition which does not conform to specifications or other inspection standards. Sometimes called discrepancies or defects. An individual nonconforming unit can have the potential for more than 1 nonconformity (e.g., a door cou
A continuous, symmetrical, bell-shaped frequency distribution for variables data that underlies the control charts for variables. When measurements have a normal distribution about 68.26% of all individuals lie within +/- 1 standard deviation from the m
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