冯同学2022-09-06 11:37:49
A is correct. As the degree of confidence is increased, the confidence interval becomes wider. A larger sample size decreases the width of a confidence interval. 老师,答案里不是写了置信度越大,置信区间越大吗,a答案里不是写的置信区间越小,置信度越大吗
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Evian, CFA2022-09-06 16:38:14
ヾ(◍°∇°◍)ノ゙你好同学,
解析没有写“置信区间越小,置信度越大”,解析写的是“置信度越大,置信区间越宽”。样本容量上升会使置信区间宽度上升。置信度和置信区间宽度成正比。
As the degree of confidence is increased, the confidence interval becomes wider. A larger sample size decreases the width of a confidence interval.
本质是:我们收集的样本数据越多,估计越精确,越确定总体均值落在的区间,这个区间越小
All else held constant, the width of a confidence interval for a population mean is most likely to be smaller if the sample size is larger and the degree of confidence is lower.
题目:在所有其他条件保持不变的情况下,如果样本量↑和置信度↓(在这样的条件下),总体均值的置信区间宽度会减小。
题目的思路是:n↑(或者置信度↓)导致confidence interval↓
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