Intro to Statistics
About this free Intro to Statistics course
Intro to Statistics is a free online statistics course that teaches students how to describe, collect, and draw conclusions from data. It follows the major units of an AP Statistics or intro college stats class, from one-variable data all the way to confidence intervals.
You'll start by distinguishing categorical from quantitative data and symmetric, skewed, and normal distributions. Then you'll measure center and spread and use z-scores and z-tables. Next come sampling methods, bias, observational studies vs. experiments, probability rules, binomial and geometric distributions, and sampling distributions. Lessons pair clear definitions with examples, so you learn both how to calculate statistics and how to interpret them in context.
Who this course is for
This course is designed for high school students in grades 10 through 12, especially those taking or preparing for AP Statistics. You'll need Algebra 1 skills. No calculus is required.
Course outline
- One-variable data. Types of data, distributions, measures of center and spread, the normal distribution, and z-scores.
- Two-variable data. Scatterplots, the correlation coefficient r, and the least-squares regression line.
- Collecting data. Sampling methods, census vs. sample, and sources of bias.
- Experiments. Observational studies vs. experiments, control, random assignment, replication, and blinding.
- Probability and random variables. Probability rules, conditional probability, expected value, binomial and geometric distributions, and PDF vs. CDF.
- Sampling distributions and inference. Sample proportions and means, the conditions for inference, and confidence interval basics.
What you'll learn
- Summarize data with the right measures of center and spread
- Use z-scores and the normal distribution to find probabilities
- Fit and interpret a least-squares regression line
- Design unbiased samples and well-controlled experiments
- Build and interpret a basic confidence interval
How long it takes
Plan on about 15 hours, or two to three hours per unit. The probability and sampling distribution units take the most practice.
Frequently asked questions about Intro to Statistics
Is Intro to Statistics really free?
Yes. Intro to Statistics is completely free, with no fees, subscriptions, or account required. STEM for Others is a 501(c)(3) nonprofit, and every course in our curriculum library is free for students, families, and teachers.
Does this course cover AP Statistics?
It covers many of the main AP Statistics topics, including exploring data, collecting data, probability, sampling distributions, and an introduction to inference. It's a strong primer or review, but it isn't an official AP course.
How do I start the course?
Click Begin Course at the top of this page to open the full slide deck in a new tab. You can also flip through the slides embedded above. Work through one unit at a time and try the practice questions before moving on.
Do I get a certificate?
The self-paced Intro to Statistics materials don't include an official certificate. If you're taking the course through a STEM for Others chapter program, ask your chapter leader about recognizing your completion.
Can teachers and clubs use this curriculum?
Yes. Teachers, homeschool families, libraries, and after-school clubs are welcome to use the Intro to Statistics materials with their students at no cost. STEM for Others volunteers also teach our curriculum in partner schools and libraries. You can find a chapter near you or start one at your school.
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