Every tool on StatsLearn
Calculators that show their steps, graphs you can drag, cards that schedule themselves, and the reference tables you actually need mid-problem. All free, no account.
Work a number out
Every calculator shows the steps, because the steps are what the exam grades.
All calculators16 calculators covering z-scores, confidence intervals, t-tests, chi-square, binomial probability, standard deviation, and regression. Each shows its work and sits next to a worked example.Z-score calculatorTurn a raw value into a z-score and a percentile, or go backwards from a percentile to a value.Confidence interval calculatorIntervals for a mean or a proportion, with the critical value and margin of error broken out.P-value calculatorOne or two-sided p-values from a z, t, or chi-square statistic, with the decision at your alpha.See it move
The concepts students find hardest are the ones you have to watch happen.
Which test should I use?decision treeAnswer two or three questions about your data and your design, and the right procedure falls out, with the calculator to run it and the guide behind it.Descriptive statistics calculatorpaste dataPaste your homework data set once and get mean, median, mode, both standard deviations, the five-number summary, flagged outliers, a boxplot and a histogram.Descriptive statistics sandboxdraggableDrag data points and watch the mean chase an outlier while the median holds still. Boxplot, SD, and IQR update live.Sampling distribution and CLT visualizerdraggablePick a lumpy population, slide the sample size, and watch the distribution of sample means turn normal and narrow by root n.Regression influential point explorerdraggableMove one point and watch the least-squares line, r, and the residual plot respond to leverage.Test yourself
Recall beats rereading. Everything here makes you produce the answer first.
Flashcardsspaced repetition102 cards with spaced repetition built in: miss a card and it comes back tomorrow, know it and it waits three weeks.Practice problems12 problem sets with every solution step worked out, from z-scores through chi-square and regression.AP Statistics cram sheetEvery formula, condition, and interpretation sentence for the exam on one page.FRQ guideHow the free-response section is scored and the sentence templates that earn the points.Look it up
Fast answers when you are mid problem set.
Statistics glossary102 terms defined in one sentence first, grouped into ten topic hubs, each linking into the guide behind it.Z-tableThe full standard normal table, with the row-and-column reading rule spelled out.T-tableCritical values by degrees of freedom and confidence level, for intervals and tests.Formula sheetThe AP Statistics formulas, annotated with what each symbol means and when to reach for it.Learn it properly
Longer reads for when the answer is not the problem, the understanding is.
Start from zeroA nine-step path from what a variable is through to regression, each step pairing a short read with something you can drag.All guides51 guides, each answering one question the way a student would ask it, then showing the work.The new exam formatnew course3 hours, fully digital, 42 multiple choice and 4 free response. What each unit is worth and what each FRQ tests, from the Fall 2026 course description.The AP Statistics courseAll five units and 55 topic pages of the Fall 2026 course framework, with exam weights.Side-by-side comparisons24 pages on the pairs students mix up: z vs t, Type I vs Type II, correlation vs regression.For teachers
Free for classroom use, no account for you or your students.
Teacher resourcesEmbeddable interactives for your LMS or class site, printable references, and how the site maps onto the Fall 2026 course.