I am new in machine learning and learning linear regression concept. Please help with answers to below queries. I want to understand effect on existing independent variable(X1) if I add a new independent variable(X2) in my model. This new variable is highly correlated with dependent variable(Y)
- Will it have any effect on beta coefficient of X1?
- Will relationship between X1 and Y become insignificant?
- Can adjusted R-square value decrease?