2) In each letter below, identify which variables can be considered with an answer variable and which can be used as an explanatory variable? explain and propose a model to explain the relationship of the chosen variables. The assumptions are reasonable for a normal regression model, why ? i) Number of cylinders, vehicle weight and car gasoline consumption; ii) race lap time, race lap distance and weather conditions during the return; iii) The weight of a person, whether the person is a smoker or not and whether the person has or not lung cancer ;