The conditional test to measure iron by means of O-phenanthroline spectrophotometry and the standard curve are improved with mathematical statistics.
用数理统计方法改进了邻菲啰啉分光光度法测定铁的条件试验和标准曲线，有效地提高了分析结果的准确性。
In this essay, we introduce in to the concept of standard score(SS), used in the statistics of high school test results, and demostrate how to delimit the test grade by using the way of SS.
本文概要地介绍了考分成绩统计中的标准分的概念，指出了标准分这一概念的作用，提出了利用标准分确定等级的考分限。
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