What is Regression Analysis? Explain the underlying assumptions in the specification of the regression model by following (OLS)? Q2. What is Multicollinearity? How presences of Multicollinearity affect results? Explain different methods of detecting Multicollinearity? Q3. What is difference between Homoscedasticity and Heteroscedasticity? Explain any two techniques used to detect Heteroscedasticity in the data. How its affect the results of the analysis?