Electric vehicles have become more popular in recent years due in part to advances in battery technology. How does full battery charge time relate to the driving range of the vehicle on a highway? The scatterplot and regression equation display this relationship for one specific electric vehicle from the current year. The equation of the regression line is ŷ=36.62 + 24.805x. Note that driving range varies with battery charge time, speed on the highway, and a number of other factors. Interpret the slope of the regression line.