The distinction between quality control attributes and variables is not an important one because the same statistical process control tools are used for both.

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The distinction between quality control attributes and variables is important as different statistical process control tools are used for each. Attributes refer to characteristics that can be counted or classified (e.g. number of defects), while variables refer to characteristics that can be measured on a continuous scale (e.g. temperature). Different tools are necessary for analyzing and improving each type of quality control.

The Distinction Between Quality Control Attributes and Variables Is Not