Tip: an Excel file template is available under the CONTENT tab that you can use to enter the information\ and solve the question. Use the template to determine the forecast values and forecast errors using the three\ Forecast Error models presented in Chapter 9 to guide your choice. See Exhibit 9.8 on page 186 for an exampleTip: an Excel file template is available under the CONTENT tab that you can use to enter the information\ and solve the question. Use the template to determine the forecast values and forecast errors using the three\ Forecast Error models presented in Chapter 9 to guide your choice. See Exhibit 9.8 on page 186 for an example