Answers to Selected Exercises

Selected answers and guidance for exercises across all 40 chapters. Organized by chapter with references to the relevant evidence.

Chapter 1: The Psychology of Pop Psychology

Exercise 9 (Write a Barnum description): Your description should include statements that are broadly true of most people: "You have a great deal of unused capacity," "You tend to be critical of yourself at times," "While you appear confident, you sometimes feel insecure." If your friend rates it 3.5+ out of 5, you've demonstrated the Barnum effect.

Exercise 11 (Is the Barnum effect a flaw or a feature?): Arguments for "flaw": it makes us susceptible to pseudoscience, invalid personality tests, and manipulation. Arguments for "feature": in ambiguous social situations, assuming descriptions apply to you may facilitate social bonding and self-reflection. Both sides have merit — the effect becomes harmful when exploited commercially.

Chapter 4: How to Evaluate a Psychology Claim

Exercise 6 (Apply toolkit to "couples who share chores are 50% less likely to divorce"): Step 1: The 50% figure is suspiciously precise. Step 2: No identifiable primary source. Step 3: No meta-analysis supports this specific number. Step 4: Studies in this area use varied samples. Step 5: The general finding (fairness → satisfaction) is replicated; the 50% figure is not. Step 6: r ≈ 0.10–0.25 for housework-satisfaction correlation. Steps 7–9: Specific percentage is unsupported. Rating: ⚠️ OVERSIMPLIFIED.

Chapter 7: Personality Test Industry

Exercise 7 (Read MBTI opposite type description): Most people find that BOTH their assigned type description AND the opposite type description contain statements they identify with. This demonstrates the Barnum effect operating within the MBTI framework. If both descriptions feel accurate, the type assignment isn't distinguishing you from others.

Chapter 12: Learning Styles

Exercise 6 (Study in non-preferred style): Most people find that studying in their "non-preferred" style doesn't significantly reduce learning — consistent with the research showing that the meshing hypothesis doesn't hold. If anything, the discomfort of using a non-preferred approach may enhance processing (desirable difficulty).

Chapter 22: Love Languages

Exercise 9 (Ask partner without love language categories): Conversations without the five-category framework tend to produce richer, more specific responses ("I feel most loved when you remember the small things I mentioned" vs. "my love language is Acts of Service"). The framework can constrain rather than facilitate genuine communication.

Chapter 28: Habits

Exercise 6 (Track habit formation with implementation intentions): Expect the behavior to feel more automatic between days 30–90, with substantial variation. If you notice automaticity before day 21, the habit was probably simpler (drinking water); if it takes longer than 66 days, it was probably more complex (exercise). Missing one day should not significantly affect the trajectory.

Chapter 29: Manifesting

Exercise 6 (Try WOOP vs. pure visualization): Most people report that WOOP feels harder but more actionable. Pure visualization feels pleasant but doesn't generate a specific plan. The contrast illustrates Oettingen's finding: positive fantasy satisfies the motivational system, while WOOP creates a plan for action.

Chapter 40: Five New Claims

See Chapter 40, Case Study 1 for detailed toolkit analyses of all five claims. Summary: all five rated ⚠️ OVERSIMPLIFIED — containing kernels of truth that the pop version distorts.

Full answer keys for all quiz questions are embedded within each chapter's quiz.md file, with answers and explanations following each question.