2) sample variance
样本方差
1.
Acquired conclusion was that the sample mean value submitted to normal distribution, and the sample variance was composed of a number of linear sum of random variable submitted to Chi-Squared distr.
得出的结论是:样本均值服从正态分布,样本方差由若干个服从卡方分布的随机变量的线性之和组成;样本均值的期望等于各管落点期望的算术平均值,方差为各管方差的算术平均值;样本方差是各管落点总体平均方差的无偏估计,方差与各管落点散布的差异相关;样本均值与方差相互独立的充要条件是:各管落点属于独立同分布样本。
2.
The estimators of functions G(t) and F(t) are extended to function J(t) and the comparative study is made,including the comparison of biases,sample variances and maximal bias.
文章把关于G(t)和F(t)的估计扩展到J(t)并对其进行了比较研究,包括偏差、样本方差和最大偏离的比较。
3.
In view of this situation, taking the samples from the entrance exam papers of art for higher education in He′nan Province in 2000 and the sample variance method and relative frequency method were used to evaluate the accuracy and stability of grading, moreover, the curve line of errors has been formed.
针对主观评分过程中存在的评分误差问题 ,从 2 0 0 0年河南省高等学校招生美术专业统考试卷中抽取样本 ,采用样本方差法与频率法对评分准确度及稳定性进行了描述与评价 ,并建立评分误差曲线 。
4) different sample size
样本数目差异
5) pooled sample variance
合并样本方差
补充资料：样本方差
分子式：
CAS号：
性质：是由样本值计算的方差，是样本标准差s的平方s2。
CAS号：
性质：是由样本值计算的方差，是样本标准差s的平方s2。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条