2019年7月28日

nonparametric method|One-Mean t-Interval Procedure|

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

posted @ 2019-07-28 21:22 YUANya 阅读(324) 评论(0) 推荐(0) 编辑

Margin of Error|sample size and E

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

posted @ 2019-07-28 20:23 YUANya 阅读(2916) 评论(0) 推荐(0) 编辑

confidence intervals and precision|The One-Mean z-Interval Procedure|When to Use the One-Mean z-Interval Procedure

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

posted @ 2019-07-28 18:47 YUANya 阅读(229) 评论(0) 推荐(0) 编辑

Point Estimate|unbiased estimator|Confidence-Interval Estimate

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

posted @ 2019-07-28 17:34 YUANya 阅读(407) 评论(0) 推荐(0) 编辑

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2019年7月28日