QUESTION 5 Simulation is a quantitative analysis technique that involves building a mathematical model that represents a real-world situation. O True O False QUESTION 6 MAD may be negative. O True O False QUESTION 7 The F-test determines if the model is valid linear) for regression. O True O False QUESTION 8 For linear regression, a variable should be added to the model if it casuse the adjusted R2 to decrease. O True O False