开发者:上海品职教育科技有限公司 隐私政策详情

应用版本:4.2.11(IOS)|3.2.5(安卓)APP下载

Grace Yu · 2022年10月03日

根据公式,样本容量变大了,反而置信区间变小了,有点想不通

NO.PZ2018062016000115

问题如下:

If analyst want to decrease the width of the confidence interval, which of the following statement should be selected.

选项:

A.

increase sample variance

B.

increase number of observations

C.

increase confidence level

解释:

B is correct, if number of observation become larger, sample variance is smaller, the width of confidence interval become smaller.

观察的次数越多,样本方差越小,置信区间的宽度越小。

不是应该样本容量越多,试错越多,信心程度越高吗

1 个答案
已采纳答案

星星_品职助教 · 2022年10月03日

同学你好,

信心程度对应的是置信度,置信度是研究人员人为设置的,不会受到n大小的影响。

样本容量对应的是估计的精确性,n增加会使得估计更为精确,对应的是更窄的置信区间。


  • 1

    回答
  • 0

    关注
  • 350

    浏览
相关问题

NO.PZ2018062016000115 问题如下 If analyst want to crease the wih of the confininterval, whiof the following statement shoulselecte A.increase sample varian B.increase number of observations C.increase confinlevel B is correct, if number of observation become larger, sample varianis smaller, the wih of confinintervbecome smaller.观察的次数越多,样本方差越小,置信区间的宽度越小。 confininterval=point estimate ± reliability factor × stanrerror如果方差变大, 标准差也会同乡变大, 上面公式里面的减数变大, 所以wih变小, 那么A为什么会是错的

2023-11-11 15:24 1 · 回答

NO.PZ2018062016000115问题如下 If analyst want to crease the wih of the confininterval, whiof the following statement shoulselecteA.increase sample varianB.increase number of observationsC.increase confinlevel B is correct, if number of observation become larger, sample varianis smaller, the wih of confinintervbecome smaller.观察的次数越多,样本方差越小,置信区间的宽度越小。 根据公式,N越大,或者方便越小,置信区间越小啊

2023-04-23 08:31 1 · 回答

NO.PZ2018062016000115问题如下If analyst want to crease the wih of the confininterval, whiof the following statement shoulselecteA.increase sample varianB.increase number of observationsC.increase confinlevel B is correct, if number of observation become larger, sample varianis smaller, the wih of confinintervbecome smaller.观察的次数越多,样本方差越小,置信区间的宽度越小。 看了一遍其他的解答,那C是错在哪儿呢

2023-01-14 21:42 1 · 回答

NO.PZ2018062016000115问题如下If analyst want to crease the wih of the confininterval, whiof the following statement shoulselecteA.increase sample varianB.increase number of observationsC.increase confinlevel B is correct, if number of observation become larger, sample varianis smaller, the wih of confinintervbecome smaller.观察的次数越多,样本方差越小,置信区间的宽度越小。 我理解,公式s/root of n中的n是sample size。现在题目中说的是number of observations变多,sample size只是取样的数,不一定会变大,那么依据公式,confininterval也不一定会变窄吧?

2022-12-01 17:10 2 · 回答