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Molecular formula :
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nature : the level of precision measurement scale. Said a group of parallel data closer to the extent of deviation of small, high-precision determination. The deviation expressed as follows. (1) the average deviation d. It said measurements of the sample average of the absolute value of the difference between the average. The measurements xi right sample average x the deviation di = xi-x (i = 1,2 ..., n) of the average deviation of d N> = | d1 | + | d2 | + ... + | dn | / n average deviation is relatively d / x × 100% (2) sample standard deviation relative standard deviation s also called the coefficient of variation (CV), expressed as a percentage of used CV = s / < N>x × 100% (3) samples the average standard deviation
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