摘要： 7.3 P-Value Approach to Hypothesis Testing† 前面步骤同one mean 值，后面计算出H0所对应的概率即为p值,再用p值与significant level相比。 -（2.6+0.05）=-2.65 p值是假如H0假设正确的情况下，得到该值的概率，如果非常 阅读全文

摘要： 9.2 Critical-Value Approach to Hypothesis Testing example: 对于mean 值 275 的假设： 有一个关于sample mean的distribution： 已知population 标准差和sample size=25的情况下： 标准型Z为 阅读全文

摘要： 9.1 The Nature of Hypothesis Testing Over the years, however, null hypothesis has come to mean simply a hypothesis to be tested. Null Hypothesis: H0: 阅读全文

摘要： 8.4 Confidence Intervals for One Population Mean When σ Is Unknown 原先是 standardized version of x bar： 当没有提供population 的标准差时，采用S（样本标准差作为population 标准差） 阅读全文

摘要： 8.3 Margin of Error 由该公式可知： To improve the precision of the estimate, we need to decrease the margin of error, E. Because the sample size, n, occurs i 阅读全文

摘要： Confidence Intervals for One Population Mean When σ Is Known Obtaining Confidence Intervals for a Population Mean When σ Is Known The z-interval proce 阅读全文

摘要： 8.1 Estimating a Population Mean Point Estimate estimate a single number, or point. 因为：the mean of the sample mean equals the population mean (μx¯ = μ 阅读全文

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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