Data Explorers
3-5Discover how information can answer real questions.
Covers
What Is Data? · Tally Charts and Picture Graphs · Bar Graphs · Line Plots and Number Data · +2 more
Learning levels
Statistics grows with you.
Three levels off one root, from a first tally chart in grade 3 to inference in grade 12. Each one assumes only what the one below it taught.
Elementary · Grades 3–5
Data is information, and information answers questions
Students meeting data for the first time. No statistics vocabulary is assumed and none is used before it has been shown.
The work is physical and visual: counting, sorting, tallying, and reading a picture graph. A student finishes able to ask a question their own class can answer, collect the answers, and say what the data shows.
- What you should already know
- Comfortable counting and comparing numbers. Nothing else.
- Courses at this level
- 1
Middle · Grades 5–9
From reading a graph to reasoning about a distribution
Students who can read a chart and are ready to ask whether it is telling the truth.
Centre and spread stop being formulas to apply and become descriptions of a shape. Probability arrives, sampling arrives, and with them the first real question in statistics: how much of what I am seeing is the world, and how much is chance?
- What you should already know
- Fractions, decimals, percentages, and reading a bar chart or line graph.
- Courses at this level
- 2
Patterns in Data
5-7Move from reading graphs to reasoning about distributions, samples, and chance.
Covers
Statistical Questions · Organizing Data · Describing Numerical Data · Visualizing Distributions · +3 more
Probability and Data Reasoning
7-9Build formal probability, distribution reasoning, and evidence-based interpretation.
Covers
The Statistical Investigation Cycle · Variables and Data Types · Distribution Shape and Center · Two-Way Tables · +4 more
High school · Grades 9–12
Inference, evidence, and the arguments people build from data
Students taking statistics as a course, preparing for AP, or wanting to read the data in front of them properly. Three routes share this level.
Sampling distributions, confidence, significance, and regression — plus the applied side: what a headline is doing when it reports a relative risk, and what a truncated axis hides. Every route ends in a full investigation of the student's own.
- What you should already know
- Algebra, and comfort with proportional reasoning. The AP route assumes the middle level's material or its equivalent.
- Courses at this level
- 3
High School Statistics Foundations
9-12A complete non-AP statistics foundation for high school.
Covers
Statistical Thinking · Categorical Data · One-Variable Quantitative Data · Comparing Distributions · +5 more
Data Literacy and Applied Statistics
9-12Use statistics in media, sports, health, and everyday decisions.
Covers
Data in the News · Visual Data Communication · Surveys and Polling · Experiments and Causation · +4 more
AP Statistics
9-12Aligned to the Fall 2026 five-unit AP Statistics framework.
Covers
Exploring One-Variable Data and Collecting Data · Probability, Random Variables, and Probability Distributions · Inference for Categorical Data: Proportions · Inference for Quantitative Data: Means · +1 more
Not sure
Start one level below where you think you are
Nothing here is locked and nothing is graded against anyone else. The first course takes about seven hours and you can open it right now without an account.