Descriptive Statistics
Statistics is the language for describing and reasoning about data. You cannot judge a model without it.
Learn it
Learn mean, median, mode, range, variance, and standard deviation — and what each tells you. Understand distributions and why the median can beat the mean for skewed data.
By the end you’ll be able to
- Compute mean, median, variance
- Summarise a distribution
Free resources
- StatQuest — Mean, Variance and Standard Deviation (video)(opens in a new tab)Start here
Intuitive walkthrough of spread and center
Free14 min - Khan Academy — Statistics & Probability(opens in a new tab)
Practice on mean, median, variance, distributions
Freeself-paced - Scribbr — Descriptive Statistics (guide)(opens in a new tab)
Concise reference on center and variability
Free15 min
Practice
Compute mean, median, and standard deviation for a column in your dataset by hand-logic, then verify with pandas.
Build it — your output
A short written “data profile” of a dataset describing its distributions in plain language, backed by stats.
Prove it — check yourself
You’re ready to move on when you can honestly say yes to each:
- Can you explain when median beats mean?
- Do you know what standard deviation measures?
- Can you describe a distribution’s shape?
Do it with AI
Use a free AI tool as your tutor and pair-programmer. Copy a prompt below into Claude, ChatGPT, or Gemini (for building, try Cursor or Copilot).
The habit: Try it yourself first — a little struggle is where the learning actually happens. Then ask for a hint before the answer — never copy blindly.
- Understand itClaude / ChatGPT / Gemini
I'm a beginner learning "Descriptive Statistics". Explain it in simple terms with a real-world analogy, then ask me ONE question to check my understanding — don't reveal the answer.
- PracticeClaude / ChatGPT / Gemini
Give me 3 short practice problems on "Descriptive Statistics" (my goal: compute mean, median, variance), from easy to hard. Don't include the solutions yet — I'll try them first, then ask you to check.
- Get unstuckClaude / ChatGPT / Gemini
I'm stuck on this exercise about "Descriptive Statistics": [paste your attempt here]. Give me ONE small hint to move forward — do NOT give me the full solution.
- Build & reviewCursor / Copilot
Here is my work for a "Descriptive Statistics" task: [paste your code or answer]. Review it: point out what's wrong and WHY, and suggest improvements — but let me make the fixes myself.
- Prove itClaude / ChatGPT / Gemini
Quiz me on "Descriptive Statistics". Ask me 5 questions one at a time, wait for my answer each time, then tell me if I'm right and briefly why.