Question: Sales data for two years are as follows. Data are aggregated with two months or sales in each period. Months Sales January-February March-April May-June July-August

Sales data for two years are as follows. Data are aggregated with two months or sales in each "period." Months Sales January-February March-April May-June July-August September-October November December 109 104 150 170 120 100 Months January-February March-April May-June July-August September-October November-December Sales 115 112 159 182 126 106 a. Plot the data. b. Fit a simple linear regression model to 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 bande, prepare a forecast for the next year

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