It was observed within the Bentley University Fall 2023 Semester Introductory Finance curriculum that applying ChatGPT-4 in a tutoring environment coincided with significantly worse student outcomes compared to no tutoring, finance tutoring, and general non-finance tutoring. This study leveraged a population of 408 freshman and sophomore undergraduates who opted-in via an IRB-approved informed consent process. The results demonstrate statistical significance under standard testing metrics and confirm several well-established principles related to the effects of tutoring and the importance of instructors for learning outcomes. A causal channel of AI interfering with learning as a "cognitive prosthesis" is proposed for further investigation.