1. 首先，计算数据的均数。假设有一组数据X，其均数（mean）的计算公式为：mean = ΣX/n，其中ΣX表示数据的总和，n表示数据的个数。2. 其次，计算数据的标准差。标准差（standard deviation）的计算公式为：σ = √[(Σ(X-mean)^2)/(n-1)]，其中Σ(X-mean)^2表示每个数据与均数之差的...
The estimated standard deviation comes within about factor of 2 of the reproducibility of the lasers themselves. This result therefore demonstrates degree of accuracy that would permit the choice of definition of the metre in which c 0 was kept constant, without substantial loss of accuracy compared...
During storage, the means of the abovementioned parameters seemed to change, but considering the large standard deviation, the change was not significant (p > 0.05). In addition, the different means and standard deviations observed could be due to the three analysed samples, which changed at ...
5. Double photoelectric sensor limit automatic correction control system and deviation rectification stability, energy saving, long life. 6. Thumb buttons, appressed bottom cutting device, bag type have many choices. 7. Don't stop machine adjust double bottom structure, ...