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兔儿爷 · 2022年10月18日

如何用计算器按

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NO.PZ201709270100000506

问题如下:

6. Based on the regression output in Exhibit 3 and sales data in Exhibit 4, the forecasted value of quarterly sales for March 2016 for PoweredUP is closest to:

选项:

A.

$4.193 billion.

B.

$4.205 billion.

C.

$4.231 billion.

解释:

C is correct. The quarterly sales for March 2016 is calculated as follows:

beginarraylln Salest-ln Salest-1=b0+b1(ln Salest-1-ln Salest-2)+b2(ln Salest4-ln Salest-5)ln Salestln3.868=0.00920.1279(ln3.868ln3.780)+0.7239(ln3.836ln3.418)ln Salest=1.44251Salest=e1.44251=4.231begin{array}{l}\ln{\text{ Sales}}_\text{t}{\text{-ln Sales}}_\text{t-1}{\text{=b}}_\text{0}{\text{+b}}_\text{1}{\text{(ln Sales}}_\text{t-1}{\text{-ln Sales}}_\text{t-2}{\text{)+b}}_\text{2}\text{(ln Sales}_{t-4}^{}{\text{-ln Sales}}_\text{t-5}\text{)}\\\ln{\text{ Sales}}_\text{t}-\ln3.868=0.0092-0.1279(\ln3.868-\ln3.780)+0.7239(\ln3.836-\ln3.418)\\\ln{\text{ Sales}}_\text{t}=1.44251\\{\text{Sales}}_\text{t}=e^{1.44251}=4.231

ln3.868−ln3.780 用计算器怎么按 算式列对了,一直得不到正确答案 , 是不是和计算器设置有关?

1 个答案

星星_品职助教 · 2022年10月18日

同学你好,

常规按法:先输入3.868,按计算器最左列的LN,直接得到1.3527。同理得到Ln3.78=1.3297,做差得到0.0230

对于本题而言,可以利用LnA-LnB=Ln(A/B)这个性质,先计算出3.868/3.78=1.0233,再按LN,直接得到0.0230

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2024-07-13 18:34 1 · 回答

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