In which of the scenarios can you reverse the dependent and independent variables while keeping the interpretation of the slope meaningful? as the number of cigarettes smoked in a day increases, the risk for lung cancer increases. as the age of an infant increases, the height of the infant increases. as the number of vehicles in a city increases, the amount of pollution in the city increases. as the concentration of salt in water increases, the density of water increases. as the number of calls made by a cell phone increases, the cell phone bill amount increases.