可改进翻译的统计术语歧义

a sample: 一个样本(a case?) > 一组抽样
two sample t test: 两样本t检验(two cases ...?) > 两组样本t检验
sample size: 样本大小(case scale?) > 样本组容量
central tendency: 集中趋势(non-dispersion?) > 中心趋势
dispersion: 离散(discrete?)趋势 > 分散趋势
SD=standard deviation: 标准方差(..variance?) > 标准离差
df=degrees of freedom: 自由度(size of freedom?) > 自由维度(dimensions of freedom)

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