PWR-124 · checking page
Check your work: Trace a benign claim to primary data and an independent limitation
Use this page only after every exercise response is locked. Return to the tutorial if you opened it too early.
Staged checking material
Answer key
- Raw S2 reduction=(1000-760)/1000=240/1000=24%.
- S2 is the earliest supplied primary meter source.
- S1 is circular with CP1 and S3 repeats S1; neither is independent confirmation.
- S4 independently adjusts for a 10% fall in occupied hours and estimates 18%, range 12%-24%.
- Bounded update: lighting use fell after renovation; raw change is 24%, adjusted estimate 18%, and skylight-only causation remains unresolved.
Scoring rule
Award 1 for exact claim capture, 1 for initial confidence, 5 for classifying all rows, 1 for the dependency chain, 1 for primary-source identification, 1 for the raw calculation, 1 for the independent limitation, 1 for the bounded update, 1 for final confidence and 1 for an evidence-linked update reason: 14 total.
Authority boundary: A governed step-by-step lesson may be completed independently inside its stated limits.