Excel Online Activity: Exponential Smoothing A retail store records customer demand during each sales period. The data has been collected in the Microsoft Excel Online file below. Use the Microsoft Excel Online file below to develop the single exponential smoothing forecast and answer the following questions. Open spreadsheet Questions 1. What is the forecast for the 13th period based on the single exponential smoothing? Round your answer to two decimal places. 2. What is the MSE for the single exponential smoothing forecast? Round your answer to two decimal places. 3. Choose the correct oraph for the single exponential smoothing forecast. The correct graph is xx