Nico has conducted an observational study to learn about how different personal experiences affect car purchases. nico surveyed 300 new car buyers at the auto mall and found that 75% of the buyers were shopping for the same model of a car they have owned before. what conclusion can nico make from his study? owning the same model of a car previously causes a buyer to purchase that car again, but he cannot draw a cause-and-effect conclusion from an observational study. there may be a link between owning a model of a car and buying that model again, but he cannot draw a cause-and-effect conclusion from an observational study. there may be a link between owning a model of a car and buying that model again, and he can draw a cause-and-effect conclusion from an observational study. owning the same model of a car previously causes a buyer to purchase that car again, but he can draw a cause-and-effect conclusion from an observational study.