yamane 1967 sample size determination formula for small population mean

6个月后一定要换2段奶粉吗澳洲指引

6个月后一定要换2段奶粉吗澳洲指引

mae formula

mae formula

几个常用的统计概念

几个常用的统计概念

standard deviation formula

standard deviation formula

为什么样本方差samplevariance的分母是n1

为什么样本方差samplevariance的分母是n1

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