对于连续变项我们计算加权的平均值差异。
For continuous data we calculated a weighted mean difference.
不同生境之间天敌物种的个体数平均值差异显著；
The species of nature enemies were significantly different between difference environment.
本文采用均值差异假设检验研究了中国、北半球和全球气温历史序列的突变现象。
Abrupt changes of yearly air temperature series in China, the Northern Hemisphere and the Globe are detected with a statistical test in this paper.
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