The following table compares the result of two response models (Model 1 and Model 2) of two variables marketing cost (X) and sales (Y). Model 1 Model 2 Chart pattern Linear S-shape a = 340.81 Estimated a = 23.43 b = 14.48 Parameter Value b = 10.51 C = 2.17 d = 69.75 In determining the model that best fits the data, what statistic can be used? ii) State an assumption for Model 1