1. Which of the following can cause the usual OLStstatistics to be invalid?You should list all answers and providejustification for your answer(s) clearly.
2. Heteroskedasticity.
3. A sample correlation coefficient of 1.00 between two independent variables both included in the model.
4. Omitting an important independent variable.
5. Detecting violation of normality.
6. When one independent variable is a constant multiple of another independent variable.