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Please see attachmentQuestion 15.11. The answer should consist of at least 275 words (approx. 20 sentences or 1,400 characters). this without re-writting the questions provided in the DB. Please send it in an editable format.ANOVARegression 360.59Residual 23.91df SS MS FCoefficients St ErrorIntercept 4.0928 1.4400×1 10.0230 1.6512×2 0.1020 0.1225×3 -4.4811 1.4400a. Write the regression equation for the above.b. Interpret the meaning of the coefficient of x3.c. Compute the coefficient of determination.d. Is the coefficient of x1 significant? Use alpha = 0.05.e. Is the coefficient of x2 significant? Use alpha = 0.05.f. Is the coefficient of x3 significant? Use alpha = 0.05.g. Perform an F test and determine whether or not the model is significant. Usealpha = 0.05.Question 15.11In order to determine whether or not the sales volume of a company (y in millionsof dollars) is related to advertising expenditures (x1 in millions of dollars) and thenumber of salespeople (x2), data were gathered for 10 years. Part of the Exceloutput is shown below:ANOVARegression 321.11Residual 63.39df SS MS FCoefficients Standard ErrorIntercept 7.0174 1.8972×1 8.6233 2.3968×2 0.0858 0.1845a. Use the above results and write the regression equation that can be used topredict sales.b. Estimate the sales volume for an advertising expenditure of 3.5 million dollarsand 45 salespeople. Give your answer in dollars.c. At alpha = 0.01, test to determine if the fitted equation developed in Part arepresents a significant relationship between the independent variables and thedependent variable.d. At alpha = 0.01, test to see if the coefficient of x1 is significantly different fromzero.e. At alpha = 0.01, test to see if the coefficient of x2 is significantly different fromzero.f. Determine the multiple coefficient of determination.g. Compute the adjusted coefficient of determination.