问题已解决
老師,這題我也不會 講解一下呢
FAILED



同學你好參考以下看看,
2024 09/03 15:25

薇老師 

2024 09/03 15:27
用回歸直線法預測公司產(chǎn)品銷售量
FAILED

薇老師 

2024 09/03 15:29
將a、b代入公式,得出結(jié)果,即2023年的產(chǎn)品預測銷售量為:y=a+bx
=2,609.16+6.22x
=2,609.16+6.22x155=3,573.26(噸)
FAILED

m80258768 

2024 09/03 15:44
a和b怎么求的

薇老師 

2024 09/03 16:11
a和b怎么求的——上面第二個圖看到了不?

m80258768 

2024 09/03 16:29
我就是看不懂才問的 這是用到了哪個知識點?

薇老師 

2024 09/03 16:35
是因果預測分析法

薇老師 

2024 09/03 16:36
通過影響產(chǎn)品銷售量(因變量)的相關(guān)因素(自變量)以及它們之間的函數(shù)關(guān)系,并利用這種函數(shù)關(guān)系進行產(chǎn)品銷售預測的方法。因果預測分析法最常用的是回歸分析法。假設(shè)銷售量(y)與其影響因素(x)之間存在關(guān)系:y=a+bx
b=?∑xッ-∑x∑yn∑x2-(∑x)2
a=∑y-b∑x_∑ x2∑y-∑x∑xyn∑x2-(∑ x)2
待求出a、b的值后,代入y=a+bx,結(jié)合自變量x的取值,即可求得預測對象y的預測銷售量或銷售額。