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

Sissiwonglx · 2022年06月01日

老师,这个题通过计算器可以找到答案,但是想麻烦老师把具体的演算步骤讲一下可以吗?

NO.PZ2015120604000050

问题如下:

The table below shows the monthly stock returns of Ivy Corp.

According to the above table , calculate the population standard deviation for Ivy Corp. returns, assuming the population has 6 observations?

选项:

A.

8.78%.

B.

8.01%.

C.

48.06%.

解释:

B is correct

σ = σ 2 = p o p u l a t i o n v a r i a n c e

Population variance is 64.2 as calculated in previous question, thus population standard deviation is 8.01, the square root of 64.2.

没搞明白absolute deviation, standard deviation, variation的区别和联系,希望老师能用这道题里的这组数据分别求一下这些值,不胜感谢!

1 个答案

星星_品职助教 · 2022年06月01日

同学你好,

①standard deviation和variance是一组,后者是前者的平方。本题计算器得到σ=8.0139(standard deviation),直接按计算器的平方键(X^2)可以得到variance=64.2222.

②MAD(mean absolute deviation)有单独的公式,将mean约等于7.7来求,MAD结果为7

③Coefficient of Variation(CV)

用mean≈7.7和standard deviation≈8.01来计算,求得CV=standard deviation / mean =1.0403


  • 1

    回答
  • 1

    关注
  • 354

    浏览
相关问题

NO.PZ2015120604000050 问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations? A.8.78%. B.8.01%. C.48.06%. B is corre σ = σ 2 = p o p u l a t i o n v a r i a n c e Population varianis 64.2 calculatein previous question, thus population stanrviation is 8.01, the square root of 64.2. 哪一个是样本的?

2023-12-18 23:39 1 · 回答

NO.PZ2015120604000050 问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations? A.8.78%. B.8.01%. C.48.06%. B is corre σ = σ 2 = p o p u l a t i o n v a r i a n c e Population varianis 64.2 calculatein previous question, thus population stanrviation is 8.01, the square root of 64.2. 按照这样数据计算出来不是答案

2023-08-19 10:08 1 · 回答

NO.PZ2015120604000050 问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations? A.8.78%. B.8.01%. C.48.06%. B is corre σ = σ 2 = p o p u l a t i o n v a r i a n c e Population varianis 64.2 calculatein previous question, thus population stanrviation is 8.01, the square root of 64.2. 2N7输入统计数据时,遇到重复的X值,Y值能否输入X值的重复个数?例如此题中有两个12%,X值输入12,Y值输入2,这样计算出来的总体方差是8.51...

2023-08-11 23:11 1 · 回答

NO.PZ2015120604000050问题如下The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations?A.8.78%.B.8.01%.C.48.06%.B is corre σ = σ 2 = p o p u l a t i o n v a r i a n c e Population varianis 64.2 calculatein previous question, thus population stanrviation is 8.01, the square root of 64.2. 问的是假如总体有六个observation,是不是说明这六个值不是整体,只是一个样本?还有虽然我知道总体和样本的方差计算,但是这二者有什么联系和应用呢?如果我有一个样本,用样本的公式计算,再用得出的数值去估衡量整体吗?是否可以讲一下计算样本统计量的意义

2022-10-22 15:00 1 · 回答

NO.PZ2015120604000050 问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations? A.8.78%. B.8.01%. C.48.06%. B is corre σ = σ 2 = p o p u l a t i o n v a r i a n c e Population varianis 64.2 calculatein previous question, thus population stanrviation is 8.01, the square root of 64.2. 老师,刚才有一题的问题是“Accorng to the above table ,Calculate the sample stanrviation for Ivy Corp. returns, assuming above tainclus all samples??”本题问题是“Accorng to the above table , calculate the population stanrviation for Ivy Corp. returns, assuming the population h6 observations?”请问既然样本和总体都为6个观察值,计算起来有什么区别呢?麻烦老师分别列一下计算过程,谢谢!

2022-08-18 00:53 3 · 回答