To create a line chart for the four$-$period moving average, you can follow these steps:$1.$ Input the actual demand and the calculated moving average values in two columns in the spreadsheet$\mathrm{.}2.$ Calculate the four$-$period moving average for each period. For example, the moving average for period $5$ will be the average of periods $2,3,4,$ and $5\mathrm{.}3.$ Once you have the actual demand and the moving average values, select the data in the two columns$\mathrm{.}4.$ In Excel, go to the "Insert" tab and select "Line Chart" to create a line chart based on the selected data$\mathrm{.}5.$ Label the chart appropriately with the period on the x$-$axis and the demand values on the y$-$axis.