1. Using the data provided by Sara in Table I calculate all possible regression equations that could be used for forecasting sales of Shiraz Company. The following step will help you to access \"regression\" in your excel file: a. To use regression, follow the following steps: 1:}. Click of \"file\" on Excel c. Click on \"Option\" d. Click on \"add-ins e. Click on \"Go\" under Manage: Excel Add-ins f. Select \"analysis toolpack\" , OK g. Click on \"Data" in the tool bar h. Click on \"data Analysis i Select regression J Now, you are ready to enter your data and run the regression