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Individual criterion see 4. These changes will not reveal day-to-day mixture materials or proportions will have a larger effect on differences in testing, curing, capping, and testing proce- the average strength level than on the standard deviation.

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Methods for determining when a change in the prompt both corrective action to increase the average reported average strength has occurred and when a run is simply due strength and an investigation to determine the source s of to random variation based on statistically rigorous analysis the decrease.

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