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摘要： 7.3 The Sampling Distribution of the Sample Mean population：1000；Scale are normally distributed with mean 100 and standard deviation 16 sample：4；可以得到样 阅读全文

摘要： 7.2 The Mean and Standard Deviation of the Sample Mean Recall that the mean of a variable is denoted μ, subscripted if necessary with the letter repre 阅读全文

摘要： 7.1 Sampling Error; the Need for Sampling Distributions 样本均值的三种表达： Sampling distribution of the sample mean Distribution of the variable x¯ Distributi 阅读全文