Researchers wanted to investigate how the amount dollar spent on medical bills in Tampa Bay varied by whether it was a hospital or a clinic, and whether the patient was treated in the spring, summer, fall, or winter season. They randomly selected 100 of the patients treated in the last 2 years and recorded the season and type of medical establishment. 1. What are the factors? 2. How many levels does each factor have? 3. What are the experimental units?