5. Decide if you agree or disagree with each of the following statements and give a brief explanation (3-5 lines) of your decision: (i) A trending variable cannot be used as the dependent variable in multiple regression analysis. (ii) A unit root process is non-stationary. (iii) To correct for seasonality, we add four dummy variables for the seasons (i.e., Spring, Summer, Fall, and Winter) to the model. (iv) The omitted variable bias is always negative