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Effective drug prevention programs use random drug tests of employees and keep their drug policies unwritten for maximum flexibility.
Pooled Standard Deviation
An estimation of standard deviation that combines two or more groups of data, assuming equal variance across these groups.
Sample Means
The average value derived from a subset of a larger population, used as an estimate of the overall population mean.
Upper Control Limit
The highest threshold in a control chart in statistical process control, beyond which a process output is considered to be out of control and indicative of a problem to be investigated.
Standard Deviation
An indicator that quantifies how much a dataset is scattered around its mean, demonstrating the distribution range of the data points.
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