Joey is getting a new puppy. He wants to know the best way to train his puppy to respond to his commands, so he recruits all of the neighborhood dogs and designs an experiment. He randomly assigns the dogs into one of three separate groups: one group of dogs receives praise as a reward for following commands, one group receives treats as a reward for following commands, and one group receives no reward for following commands. Joey concludes that the group that received praise performs the best at following commands. This is an example of a: Within-subjects design Quasi-experimental design Correlational study Between-subjects design