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

姜汁皮蛋 · 2022年01月20日

怎么计算每一个x standardized

NO.PZ2020010302000009

问题如下:

Consider the following data on a discrete random variable X:

a. Calculate the mean and variance of X.

b. Standardize X and check that the mean and variance of X are 0 and 1 respectively.

c. Calculate the skew and kurtosis of X.

选项:

解释:

a. The mean is -0.803 and the variance is 6.762.

b.



c.



Hence, the skew of X is -0.581 and the kurtosis of X is 2.773.








不知道怎么计算每一个表格中的 x standardized

2 个答案

李坏_品职助教 · 2022年01月23日

嗨,爱思考的PZer你好:


考试不会考这种一大堆数字求standardized的,这个知识点掌握计算原理就行了

----------------------------------------------
就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

李坏_品职助教 · 2022年01月20日

嗨,爱思考的PZer你好:


x standardized等于每一个(每一个X - X的平均数) / x的标准差。 比如第一行的X=-2.456,我们用(-2.456 + 0.803) /2.6 = -0.636

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

JK_MMMM · 2022年01月23日

考试的时候用计算器这个也只能一个一个摁吗? 2nd stat 没有帮我们算出x standardized

  • 2

    回答
  • 1

    关注
  • 426

    浏览
相关问题

NO.PZ2020010302000009 问题如下 Consir the following ta on a screte ranm variable X:Calculate the meanvarianof X. Stanrze X ancheththe meanvarianof X are 0 an1 respectively.Calculate the skew ankurtosis of X. The meis -0.803 anthe varianis 6.762.b.c.Hence, the skew of X is -0.581 anthe kurtosis of X is 2.773. 我看回答里需要准备一张标准正态的分布概率表,意思是考试我们把还需要带一张准备一张标准正态的分布概率表吗?

2024-01-14 12:30 1 · 回答

NO.PZ2020010302000009 问题如下 Consir the following ta on a screte ranm variable X:Calculate the meanvarianof X. Stanrze X ancheththe meanvarianof X are 0 an1 respectively.Calculate the skew ankurtosis of X. The meis -0.803 anthe varianis 6.762.b.c.Hence, the skew of X is -0.581 anthe kurtosis of X is 2.773. 如果在计算过程中,发现数字输或符号输入有误,怎样删除现有的错误数字或符号而不影响计算过程?

2024-01-07 18:42 1 · 回答

NO.PZ2020010302000009 问题如下 Consir the following ta on a screte ranm variable X:Calculate the meanvarianof X. Stanrze X ancheththe meanvarianof X are 0 an1 respectively.Calculate the skew ankurtosis of X. The meis -0.803 anthe varianis 6.762.b.c.Hence, the skew of X is -0.581 anthe kurtosis of X is 2.773. 具体怎么标准化的,能写出来标准化的具体过程么。谢谢

2023-08-04 10:14 2 · 回答

NO.PZ2020010302000009 问题如下 Consir the following ta on a screte ranm variable X:Calculate the meanvarianof X. Stanrze X ancheththe meanvarianof X are 0 an1 respectively.Calculate the skew ankurtosis of X. The meis -0.803 anthe varianis 6.762.b.c.Hence, the skew of X is -0.581 anthe kurtosis of X is 2.773. x stanrze什么意思?为啥表格下面variance的x stanrze是1?

2023-06-08 14:22 1 · 回答

NO.PZ2020010302000009问题如下Consir the following ta on a screte ranm variable X:Calculate the meanvarianof X. Stanrze X ancheththe meanvarianof X are 0 an1 respectively.Calculate the skew ankurtosis of X.The meis -0.803 anthe varianis 6.762.b.c.Hence, the skew of X is -0.581 anthe kurtosis of X is 2.773.手算还是计算器算,。

2023-05-06 16:45 1 · 回答