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Run charts are useful in discovering patterns that occur over time.
Trends are patterns or shifts according to time. An upward trend, for instance, would contain a section of data points that increased as time passed. A population is the entire data set of the process. If a process produces one thousand parts a day, the population would be the one thousand items. A sample is a subgroup or small portion of the population that is examined when the entire population can not be evaluated.