Excel Online Activity: Moving Average 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 three-period and four-period moving average forecasts and answer the following questions. Open spreadsheet Questions 1. What is the forecast for the 13 th period based on the three-period moving average? Round your answer to two decimal places. 2. What is the MSE for the three-period moving average? Round your answer to two decimal places. 3. Choose the correct graph for the three-period moving average forecast. The correct graph is 4. What is the forecast for the 13th period based on the four-period moving average? Round your answer to two decimal places. 5. What is the MSE for the four-period moving average? Round your answer to two decimal places. 6. Choose the correct graph for the four-period moving average forecast. The correct graph is MovingAverageForecastingA Periods in moving average 3 \begin{tabular}{|l|l|l|l|} \hline TimePeriod & Demand Forecast Error Error & Formulas \end{tabular} \begin{tabular}{|l|l|} \hline 1 & 89 \\ \hline 2 & 87 \\ \hline 3 & 82 \\ \hline 4 & 83 \\ \hline \end{tabular} 5 87 88 87 989 10 12 Next period forecast: 13 MSE 4 Periods in moving average