(d) of the variability in the median sales prices of homes ($/sqft) in Ames is explained by the quadratic trend over time. (e) Based on your estimated AR(1] model provide a prediction for the residual for J uly of 2016. (f) Find the updated forecast for median sales price for Arnes homes [${sqft} for July of 2016 using the information from the previous parts of this problem. This update should be based on the quadratic trend and the correlation (serial correlation) between observations. Show your work for full credit