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Short diagnostic hints for the two Practice on your own problems in this chapter. Attempt each problem before opening the hint. Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Problem 1 — the confirmation-turn design
Restated: Copilot returns «Q3 churn was 12.4%.» You know the model has three churn fields (logo churn, revenue churn, gross vs net churn). Write the one-sentence confirmation-turn prompt you would send Copilot, and name the four things you would check in the response.
Show a diagnostic hint
Diagnostic cue. Design the confirmation turn so the model exposes its interpretation before answering.
Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Problem 2 — the unanswerable question
Restated: A support director asks «what percentage of Q3 tickets were resolved because of our new AI assistant?» The model has ticket resolution times and resolution outcomes but no field linking outcomes to the specific tool that closed the ticket. Diagnose which of the three surviving failure classes from this chapter is firing, and name the upstream fix (Prep won’t help).
Show a diagnostic hint
Diagnostic cue. Classify what the model cannot answer from the available model before prompting it to infer.
Complete answers appear in Appendix G of The Defensible Decision: Practice Workbook.
Related on this site
- Chapter 11 companion page — further reading, self-check quiz, and the prep-for-AI activity.
- All chapter companion pages.
- Feedback — share corrections and improvement opportunities across all chapters.
About the three-tier Practice format
Each chapter of the book closes with a three-tier Practice block adapted from Cole Nussbaumer Knaflic's course-adoption pattern in Storytelling with Data: Let's Practice!: Practice with us (one worked problem with full solution in the book), Practice on your own (open problems with complete answers in Appendix G of the Practice Workbook; this page offers short diagnostic hints), and Practice at work (an open-ended prompt to apply the chapter's move to a live artifact). This page hosts the middle tier.