[n[ ]: [n[ ]: [n[ ]: Scatterplot the relationship between cost of the round-trip-fare and days-purchased-in-advance for business class seats and non business class seats Scatterplot the relationship between cost of the round-trip-fare and days-purchased-in-advance for refundable and non refundable air fares Scatterplot the relationship between cost of the round-trip-fare and days-purchased-in-advance for fares that include a Saturday night and those that do not.