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Chemistry

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Analytical Chemistry

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Chemical Applications of Statistical Analyses

Mean, Median, Range, Precision & Accuracy

Description

Statistical analysis helps compare repeated measurements and judge how good the results are. When the same sample is measured again and again, small differences can appear. These differences are called errors. Researchers use statistics to describe the data and to decide whether a method is suitable.

Transcript

分析通常通过对同一样品进行重复采样或重复测量来进行。这会导致结果分散,而不是单个值。获得的结果与真实值或预期值或中心值之间的差异称为该测量中的误差。

一组分散结果的中心值是估计的平均值或中位数。

Mean 是仿行测量值的总和与总数之间的比率。或者,中位数是记录中的中间值,按递增或递减顺序排列。

范围是重复测量值中最大值和最小值之间的数值差值。

精度表示不同重复测量之间的接近程度。准确性反映了测量值与真实值或中心值的接近程度。

统计分析可以对分析结果进行分类和表征,以对数据质量做出客观的决策。

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