Final answer:
The Yellow Brick Road ice cream parlor uses a fixed ratio reinforcement schedule, rewarding customers with a free item after every ten purchases, a predictable pattern characteristic of fixed ratio schedules.
Step-by-step explanation:
The Yellow Brick Road ice cream parlor has you on a fixed ratio reinforcement schedule. This schedule is predictable and produces a high response rate, with a short pause after reinforcement. In this instance, you receive a free ice cream after a fixed number of purchases, specifically after every ten items, which is characteristic of a fixed ratio schedule. This is similar to employees earning a commission after selling a set number of items, where their reinforcement is not based on the time interval but rather the number of responses or purchases.