Please show steps and/or screenshots from excel

Using Excel to complete the following questions. You may give your answers to all of the questions in the Excel file and upload the Excel file only to Blackboard. If so, you must indicate your answers clearly. Alternatively, you may give your answers in the Word file and upload both the Word and Excel files to Blackboard. 1. Sales data for two years are as follows. Data are aggregated with two months of sales (in 1,000 units) in each "period." a) Plot the data. b) Fit a linear regression model to all the sales data. c) In addition to the regression model, determine multiplicative seasonal index factors. A full cycle is assumed to be a full year. d) Using the results from parts b) and c), prepare a forecast for the next year