SQS USES message sampling based on weighted random distribution, and it returns messages only from the sampled subset of servers when you query for messages.
SQS使用基于加权随机分布的消息取样，在查询消息时，它只从取样的一部分服务器返回消息。
Most statisticians would not argue if you decided to reject the null hypothesis that the results can be accounted for in terms of random sampling variability from the null distribution.
如果您决定 排除虚假设— 结果可以按照零分布的随机抽样可变性获得，那么大多数统计师都不会有争议。
In this paper, the author arrives at the method keying to random sampling sum distribution in normal statistics structure.
给出了常见的统计结构中随机样本和的分布的求解方法。
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