Exercise 6: Moderation and mediation

1. Build leadership and engagement scale scores.
2. Center workload and organizational support.
3. Estimate burnout ~ workload_c * support_c plus age and tenure controls.
4. Interpret the interaction term and plot it.
5. Estimate the mediator model for engagement.
6. Estimate the performance outcome model.
7. Run the mediation procedure with a fixed seed.
8. Describe the indirect association without making a causal claim.
9. Write one sentence distinguishing moderation from mediation.