误差理论与不确定度表达（三）肖明耀（中国计量科学研究院，北京１０００１３）７．ｔ分布或学生分布（１）贝塞尔公式在实际相同条件下，对某一稳定的量进行几次测量，得值ｘ１，…，ｘｎ。可求得算术平均值：ｘ＝（ｘ１＋…＋ｘｎ）／ｎ残余误差：残差平方和：自由度：... Error Theory and Expression of Uncertainty (3) Xiao Mingyao (China Institute of Metrology, Beijing 100013) 7. t distribution or distribution of students (1) Bessel formula under the same conditions, a number of stable measurements, the value of x1, ..., xn. Find the arithmetic mean: x = (x1 + ... + xn) / n Residual error: residual sum of squares: degrees of freedom: ...