This tool is used to test the null hypothesis that there is no difference between two population means against either one-sided or two-sided alternative hypotheses.
此工具用于检验两个总体平均值之间不存在差异的空值假设，而不是单方或双方的其他假设。
Cole, from the back, and Rooney, filling out, provided the alternative flexibility when Gerrard moved from his left-sided position.
科尔从左路助攻而上，而鲁尼则适时的灵活的回撤，当杰拉德从左路助攻而上。
Cole, from the back, and Rooney, filling out, provided the alternative flexibility when Gerrard moved from his left-sided position.
科尔从左路助攻而上，而鲁尼则适时的灵活的回撤，当杰拉德从左路助攻而上。
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