## 2017-04-20

\frac{21}{2\sqrt{n}}

$$\frac{21}{2\sqrt{n}}$$

## L7 | Sample Distribution

L7 | Sample Distribution

distribution of sampe means = sampling distribution

mean of the sample means is the population means

Central Limit Theorem (中心极限定理)

SE: standard error, which is also SD of samples of means

SD of population mean (sigma)

SD of sample means (SE)

the ratio of sigma to SE i......