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NOTE: The above tolerances are to be used when comparison of test results is by split samples. A <br />tolerance of plus or minus two standard deviations shall be used when comparison of test results is by <br />proficiency samples. <br />EXAMPLE: Plasticity Index <br />Job Control test value <br />18 <br />IA Test value <br />22 <br />Mean <br />20 <br />20% difference <br />4 <br />Both values are within 20% of the mean. <br />