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威廉王Wei Wang · 2023年08月11日

计算器DATA功能的使用

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.

2ND按7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...

1 个答案

星星_品职助教 · 2023年08月12日

同学你好,

这样输入是错误的。

Y值代表新的一列数据,不是X出现的频率。

如果“X值输入12,Y值输入2”,相当于X这一列数据只有一个12;但多了一列Y数据,其中有一个数字是2

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