A researcher has collected the following data on price of good X, price of good Y and quantity demanded of good X. Required: a) Estimate the relationship between quantity demanded of good X using price of X and Y as the independent variables. b) Interpret the coefficients of your estimated regression line. c) Determine the quantity demanded of good X that would be demanded if price of X=5 and price of Y=4. Question 2: i. Discuss the concept of economic plausibility. ii. Discuss the assumptions and limitations of the linear regression model and the implications if such are violated. Question 3: Discuss the various classifications of costs and cite relevant examples of their applicability in the contemporary business environment (Use of diagrams and relevant examples is highly encouraged)