with the skill
**$39 — the median order value this week.** Use this as “typical” because the $640 and $1,250 orders pull the mean up to $129.80.
statistical-analysis
what it does
Apply statistical methods including descriptive stats, trend analysis, outlier detection, and hypothesis testing. Use when analyzing distributions, testing for significance, detecting anomalies, computing correlations, or interpreting statistical results.
Same request, same model, once with the skill and once without. Read both and judge for yourself.
“What's our typical order value this week? I need one number for the weekly report.”
Source material given with the request
Order values this week (USD), 20 orders:
18, 22, 25, 27, 29, 31, 33, 34, 36, 38, 40, 42, 45, 48, 52, 55, 61, 70, 640, 1250
without
**$39 — median order value this week**, reflecting a typical order without being skewed by the two unusually large purchases.
Answers are shown exactly as the model wrote them, from the first try, and nothing is picked by hand.
Claude Sonnet 5.5
made by Anthropic
claude-sonnet-5-5 · revision not reported by the provider
1 try per case · tested 3 Nov 2026
GPT-6.1 Sol
made by OpenAI
gpt-6.1-sol · revision not reported by the provider
1 try per case · tested 3 Nov 2026
landing-page-simpson
“Which landing page converts better? Looks like B is the clear winner to me.”
segment-pvalue-multiple-tests
“Marketing wants to put next quarter's budget into Ohio because the analysis found a significant lift there (p = 0.02). Is that sound?”
signup-anomalies-before-removal
“Here are daily signups for the last four weeks. Flag anything anomalous. I'm planning to drop outliers before I compute the monthly average.”
store-layout-paired-test
“I tested whether our new store layout increased sales. I ran a two-sample t-test and got p = 0.63, so I'm going to report that the layout did nothing. Is my conclusion right?”
typical-order-value-skewed
“What's our typical order value this week? I need one number for the weekly report.”
Download the .zip and unzip it. Put its files, in a folder named statistical-analysis, here:
Claude Code
~/.claude/skills/Every project. For one project only, use .claude/skills/ inside it.Codex
~/.agents/skills/Every project. For one repository only, use .agents/skills/ inside it.Cursor
~/.cursor/skills/Cursor also reads the Claude Code and Codex folders above.Then start a new session and ask for what the skill does. Other agents that read SKILL.md have their own skills folder; check their docs.
Coming after launch: get skills from inside your agent, no download needed.