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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

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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

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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

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