HW 8: Scatterplots & Linear Models Show your work! 1. Vehicle Registrations Vehicle Registr gistrations in the United States, 1925-2011 Register dairy estime Vehicles millions y= 3.0161 x 1930- 58128 bazit 300 4= 1.6 million Reg 250 y = 3,0161x - 5819.5 200 Registrations (in millions) 100 50 0 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 X -50 Year Use the above scatterplot and trendline equation to answer the following questions: a. What is the slope of trendline equation? 3 , D16 1 Serisel tonigg aillhol yes Jo. Interpret the meaning of the slope for this trend line. What (title) either increased or decreased by mat) y unit pork-unit from yo to yo. Vehicle Registrations increased by 3.0161 million registrations per year from 1925 to 2011 . c. Use the trend line equation to estimate the number of vehicle registrations in 1970. Round to nearest million. d. How does the estimated value from part c compare with the actual value for 1970? (The actual value is the blue dot for 1970.) Quantify your answer. e. Would you classify this correlation as strong, moderate or weak? Positive or negative? Explain. f. What is the scope of the model from the graphic above? g. Should we use this model to predict the number of vehicle registrations for 2025? Why? 24