Conciseness

The body is a lean reference with no padding — it never explains what a t-test or ANOVA is, and every line states a test, threshold, or format that Claude would not reliably reproduce from memory, matching the 'lean and efficient; every token earns its place' anchor; it is clearly above the 'minor over-explanation' (4) anchor.

Actionability

Provides concrete, copy-ready guidance — exact APA templates ('t(df) = X.XX, p = .XXX, d = X.XX') and specific thresholds (VIF < 5, Cohen's d 0.2/0.5/0.8) — but stops at lookup tables rather than giving a runnable worked example or sample analysis call, fitting 'mostly executable guidance; minor gaps' and falling short of the fully copy-paste-ready (5) anchor.

Workflow Clarity

The content is organized into a coherent decision framework (test selection list, then assumptions, then reporting format, then effect sizes, then pitfalls) but presents static reference rather than an explicit step sequence; since this is not a destructive or batch operation the 3-cap does not apply, and the clear organization places it above 'sequence present but checkpoints missing' (3) yet below the explicit validate-retry (5) anchor.

Progressive Disclosure

The body is under 50 lines, self-contained with no external references, and divided into well-labeled sections (Test Selection, Assumption Checking, APA Reporting, Effect Sizes, Common Mistakes); per the simple-skill exception, this warrants the top anchor without separate reference files.

Specificity

Lists three concrete actions — 'Statistical test selection, assumption checking, and APA-formatted reporting' — which is more than the 1-2 of a score-3 anchor, though coverage is not exhaustive (e.g., no mention of diagnostic plotting or power analysis), fitting the 'several specific actions; minor gaps' anchor.

Completeness

Explicitly answers both what ('Statistical test selection, assumption checking, and APA-formatted reporting') and when ('Use when analyzing experimental results or writing results sections'); the 'when' is explicit but offers only two trigger scenarios rather than the concrete, varied trigger phrases of a score-5 anchor, so it fits the 'both present, when could be more explicit' anchor.

Trigger Term Quality

Includes natural phrases users would say — 'analyzing experimental results', 'writing results sections', 'statistical test' — but omits common synonyms like 'hypothesis test', 'p-value', or 'regression' from the description itself, so it falls short of comprehensive (5) yet sits clearly above 'some relevant keywords' (3).

Distinctiveness Conflict Risk

The combination of statistical test selection and APA-formatted reporting carves a clear niche with distinct triggers, but 'writing results sections' creates minor overlap risk with general scientific-writing skills, matching 'mostly distinct; minor overlap risk' rather than the minimal-conflict score-5 anchor.