The value for Z used in quality control charts is based on the degree of confidence you want to have in the resulting UCL and LCL values.

Name: The value for Z used in quality control charts is based on the degree of confidence you want to have in the resulting UCL and LCL values.
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The Z value in quality control charts corresponds to the standard deviation multiplier, which is chosen based on the desired confidence level for the Upper Control Limit (UCL) and Lower Control Limit (LCL).

The Value for Z Used in Quality Control Charts Is