An ice cream store is investigating the factors that may explain sales. SALES is the dependent variable. The independent variables are temperature (TEMP) and competition (COMP). (a) Write the regression equation showing the relationship between the dependent and independent variables. (b) The store is also concerned with the effect of the various seasons on the consumption of ice cream. The following seasons are considered (summer, fall, winter, and spring). Rewrite the model in (a) that accounts for seasonal effect. Explain each of your steps.