Question

Why do we need regression analysis? Why not simply use the mean value of the regression as its best value?​

Answer 1

Answer:

In actual data we never get the mean of the regressand. We rather get samples which may be close or far away from the mean so it may be uncertain as to the sample value.

Explanation:

Answer 2

A: Regression analysis is used when you want to predict a continuous dependent variable from a number of independent variables. If the dependent variable is dichotomous, then logistic regression should be used. ... The independent variables used in regression can be either continuous or dichotomous.

B: In actual data we never get the mean of the regressand. We rather get samples which may be close or far away from the mean so it may be uncertain as to the sample value.