摘要
对实验报告的评分需要评价实验数据的准确度和精密度,如若直接用全体平均值代替真实值来评价准确度,往往会带来误差。从全体实验测量值所服从的分布出发,通过对数变换将其转化为偏斜度为零的正态分布,此时的全体平均值就极为接近真实值,也就可依据离全体平均值越近越优的原则评分。对于精密度,则以相对平均偏差越小越优的原则评分。最后等权重考虑准确度和精密度,为每位学生的实验报告打分。具体的实例表明了该方法的有效性。
One needs to evaluate the accuracy and precision of the experimental data when grading students ’s experimental re-ports ,however ,it usually causes errors if the average is used directly to evaluate the accuracy.It is feasible to transform the dis-tribution of the experimental data to be normal distribution with the skewness to be zero ,under this condition ,the average is very close to the true value.The final grades of experimental reports are given with the following principles ：the smaller the difference between the experimental data and the average is ,the better the accuracy becomes ;the smaller the relative average de-viation is ,the better the precision becomes.The practice demonstrates the availability of this strategy.
出处
《高教论坛》
2014年第2期49-52,共4页
higher education forum
基金
西北农林科技大学教学改革研究项目"无机及分析化学实验报告成绩评定系统的建立"(JY1302093)
关键词
实验报告成绩
正态分布
准确度
精密度
grade of experimental report
normal distribution
the accuracy
the precision
