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按ＧＢ3 3 5 8 82《统计学名词及符号》的有关规定书写 ,常用如下 :①样本的算术平均数用英文小写 ｘ(中位数仍用Ｍ) ;②标准差用英文小写ｓ;③标准误用英文小写ｓ ｘ;④ｔ检验用英文小写ｔ;⑤Ｆ检验用英文大写Ｆ ;⑥卡方检验用希文小写 χ2 ;⑦相关系数用英文小写ｒ ;⑧自由
According to GB3 3582 82 “statistical terms and symbols” of the relevant provisions of writing, commonly used as follows: ① sample arithmetic mean with lowercase English x (median still use M); ② standard deviation in lowercase s; ③ standard Misuse English lowercase s x; ④ t test in lowercase English t; ⑤ F test in uppercase F; ⑥ chi-square test with lowercase χ2; ⑦ correlation coefficient in lowercase English r; ⑧ free