This decision tree (CART) shows how car price is predicted based on mileage, year, and population. The very first split is on mileage — cars with more than 30,000 miles tend to be cheaper overall. From there, the tree branches out based on how old the car is (year) and where it's being sold (state population). For example, cars with high mileage and older model years (before 2015) end up with average prices around $7,395, while low-mileage cars in less populated areas can reach over $36,000.
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The CART model gave a decent performance, with an RMSE of around $9,872 and an MAE of about $7,333. This means the model’s predictions were off by about $7K–10K on average. The R-squared value was 0.30, so it was able to explain around 30% of the variation in car prices.
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