b:head_first_statistics:estimating_populations_and_samples
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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| b:head_first_statistics:estimating_populations_and_samples [2021/12/03 08:10] – [Exercise] hkimscil | b:head_first_statistics:estimating_populations_and_samples [2022/11/15 23:44] – [Sampling distribution of sample mean] hkimscil | ||
|---|---|---|---|
| Line 237: | Line 237: | ||
| < | < | ||
| + | > | ||
| > p <- 0.25 | > p <- 0.25 | ||
| > q <- 1-p | > q <- 1-p | ||
| Line 245: | Line 246: | ||
| > o.c <- .4 - (1/(2*n)) | > o.c <- .4 - (1/(2*n)) | ||
| > o.c | > o.c | ||
| + | [1] 0.395 | ||
| > pnorm(o.c, p, se, lower.tail = F) | > pnorm(o.c, p, se, lower.tail = F) | ||
| - | [1] 0.0004313594 | + | [1] 0.0004060586 |
| </ | </ | ||
| Line 268: | Line 270: | ||
| \overline{X} = \frac{X_{1} + X_{2} + . . . + X_{n}}{n} | \overline{X} = \frac{X_{1} + X_{2} + . . . + X_{n}}{n} | ||
| \end{eqnarray*} | \end{eqnarray*} | ||
| + | 위는 풍선검 봉지 30개로 이루어진 샘플의 평균을 이야기하고 | ||
| + | 아래는 이 평균을 계속 모았을 때의 평균을 이야기한다. | ||
| \begin{eqnarray*} | \begin{eqnarray*} | ||
| E(\overline{X}) & = & E\left(\frac{X_{1} + X_{2} + . . . + X_{n}}{n}\right) | E(\overline{X}) & = & E\left(\frac{X_{1} + X_{2} + . . . + X_{n}}{n}\right) | ||
b/head_first_statistics/estimating_populations_and_samples.txt · Last modified: 2022/11/17 12:47 by hkimscil