DEMAND April 75 May 60 June 90 July 75 August 95 88 September a. Using a simple four-month moving average, calculate a forecast for October. Note: Round your answer to 2 decimal places. Answer is complete and correct. Forecast for October 87.00 b. Using single exponential smoothing with a = 0.10 and a September forecast = 80, calculate a forecast for October. Note: Round your answer to 2 decimal places. Answer is complete and correct. Forecast for October 80.80 c. Using simple linear regression, calculate the trend line for the historical data. Say the X axis Is April = 1, May = 2, and so on, while the Y axis is demand. Note: Round your Intercept value to the nearest whole number and slope value to 2 decimal places. Y = + t d. Calculate a forecast for October using your regression formula. Note: Round your answer to 2 decimal places. Forecast for October