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syzsg004 · 2022年08月21日

搞不清楚,degree of confidence 和 confidence level

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。

95%是degree of confidence

5%是confidence level

不是confidence level 越大,confidence interval 就越窄吗

1 个答案

星星_品职助教 · 2022年08月21日

同学你好,

95%是的degree of confidence相当于95%的confidence level。

5%的是significance level。

----

confidence level越大,对应的critical value(reliability factor越大),根据置信区间的公式,此时置信区间变宽。

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