b. Use regression to estimate the deseasonalized demand in each of the given months. Using these base values, compute a seasonal index for each month. (Do not round intermediate calculations. Round your answers to 3 decimal places.) c. Are the seasonal indexes computed in parts a and b the same or different? Same Different d. Using the regression model and the seasonal indexes you computed in part b. compute a seasonally adjusted forecast for January, February, March, April, and May of the next year. (Round your answers to 3 decimal places.) The following data show the number of laptop computers sold each month at a retail store: a. Using the average demand for the year as the base; compute a seasonal index for each month. (Do not round intermediate calculations. Round your answers to 3 decimal places.)