Regression lines are used in the financial sector and in business. Various financial analyst employs linear regressions to forecast stock prices, commodity prices and to perform valuations for many different securities.

Where can we use regression line?

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.

Where simple linear regression is used?

Simple linear regression is used to estimate the relationship between two quantitative variables. You can use simple linear regression when you want to know: How strong the relationship is between two variables (e.g. the relationship between rainfall and soil erosion).