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Which is more myth than reality as parents' age?
Pooled Standard Deviation
A method to estimate the overall standard deviation from several different samples or groups, assuming each group has the same variance.
Sample Means
The average values obtained from statistical samples drawn from a population.
Zone Boundaries
Predetermined limits in a chart or graph that separate different levels of data for analysis or categorization purposes.
Lower Control Limit
In quality control charts, it is a threshold value below which a process is considered out of control and indicating a systemic decrease in quality.
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