1- Construct a forecasting model that can forecast the sales for January through December of the fourth year using a regression model that includes only seasonal effects with dummy variables for each month

2-What is the MSE for the model

3-Construct a model that can forecast the sales for January through December of the fourth year using a regression model that includes both trend and seasonal effects with dummy variables for each month

4-What is the MSE for the model

5-Which model has the smaller error a-model with only seasonal effect b- model with both trend and seasonal effects

Using the model with the smaller MSE error, if January sales for the fourth year are $295 (in $1,000s), what is your forecast error (in $1,000s)? For example,

Month First Second Third Year Year Year January 242 263 282 February 235 238 255 March 232 247 265 April 178 193 205 May 184 193 210 June 140 149 160 July 145 157 166 August 152 161 174 September 110 122 126 October 130 130 148 November 152 167 173 December 206 230 235