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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本进行重复取样或多次测量来完成。这会导致结果分散,而非单一数值。所得结果与真实值或期望值,或中心值之间的差异,称为该测量的误差。

在一组离散结果中,中心值是估计的均值或中位数。

平均值是所有重复测量值的总和与测量值总数之间的比值。而中位数则是将所有数据按升序或降序排列后位于中间的数值。

极差是重复测量中最大值与最小值之间的数值差。

精确度表示不同重复测量结果之间的接近程度。准确度反映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,以客观地判断数据质量。

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