a) Write down the estimated regression equation and interpret each coefficient of the independent variables. [4 marks] b) Calculate the coefficient of determination (R2) and the adjusted R-square (Rad;). [4 marks] c) Find the F test statistic and its corresponding p-value to test for the overall significance to determine the overall significance of the relationship between the customer's willingness to spend and the three independent variables. What is your conclusion? [6 marks] (Note that the critical value of F is 3.59 when the degree of freedom in the numerator = 3 and in the denominator = 11) d) Calculate each of the test statistics t and its corresponding p-value (use the t- distribution table) for the customer's user experience (x2) and the number of pageviews (x3). Determine if each independent variable gives a significant contribution to predict the amount of money the customer's willingness to spend. [6 marks]