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Danielle靓靓 · 2018年10月26日

问一道题:NO.PZ2017092702000107

问题如下图:

    

选项:

A.

B.

C.

提问:请问老师A和C哪里错了?谢谢您

解释:



1 个答案

菲菲_品职助教 · 2018年10月26日

同学你好,这道题目考的也是中心极限定理。

A选项错是因为,不管总体服从什么分布,只要满足条件,这个样本分布都服从正态分布。

C错是因为,样本的方差等于总体的方差除以n,而不是和总体方差相等。

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NO.PZ2017092702000107 问题如下 A population ha non-normstribution with meµ anvarianσ2. The sampling stribution of the sample mecomputefrom samples of large size from thpopulation will have: A.the same stribution the population stribution. B.its meapproximately equto the population mean. C.its varianapproximately equto the population variance. B is correct. Given a population scribeany probability stribution (normor nonnormal) with finite variance, the centrlimit theorem states ththe sampling stribution of the sample mewill approximately normal, with the meapproximately equto the population mean, when the sample size is large.给定具有有限方差的任何概率分布(正态或非正态)描述的总体,中心极限定理指出,当样本大小足够大的时候,样本均值为正态分布,其中样本均值等于总体均值。 No.PZ2017092702000107 (选择题)来源: 原版书A population ha non-normstribution with meµ anvarianσ2. The sampling stribution of the sample mecomputefrom samples of large size from thpopulation will have:您的回答正确答案是: BAthe same stribution the population stribution.B正确its meapproximately equto the population mean.Cits varianapproximately equto the population variance.请老师解答一下谢谢

2022-12-08 15:35 1 · 回答

NO.PZ2017092702000107 问题如下 A population ha non-normstribution with meµ anvarianσ2. The sampling stribution of the sample mecomputefrom samples of large size from thpopulation will have: A.the same stribution the population stribution. B.its meapproximately equto the population mean. C.its varianapproximately equto the population variance. B is correct. Given a population scribeany probability stribution (normor nonnormal) with finite variance, the centrlimit theorem states ththe sampling stribution of the sample mewill approximately normal, with the meapproximately equto the population mean, when the sample size is large.给定具有有限方差的任何概率分布(正态或非正态)描述的总体,中心极限定理指出,当样本大小足够大的时候,样本均值为正态分布,其中样本均值等于总体均值。 RT

2022-09-18 13:05 2 · 回答

NO.PZ2017092702000107 这个题是不是应该放在中心极限定理部分?

2022-02-11 16:56 3 · 回答

请问老师A为什么是错的呢?不是说large就会都趋于正态分布吗?不就是same stribution吗?谢谢!

2019-11-21 15:16 2 · 回答