Fifty-five components in the states they can be in, in the order the bundle loads them. Switch the accent to see what a preset changes: actions, links, focus and progress. Callouts, the highlighter and charts stay put.
8px buttons in Lexend: slate-teal primary, secondary, ghost, small, large, block, icon-only, toggle, loading and disabled, plus the action group.
Small 6px tags for level, week, lesson type and status, a highlighter tag, an outline tag and the count bubble.
The highlighter: a yellow marker behind a phrase in body text, and a lower swipe for the one marked phrase in a heading.
The standard deviation is in the same units as the data, which is why it is easier to read than the variance. Keep n − 1 for samples.
One dismissible line above the nav for enrollment dates and cohort news; remembers the dismissal per visitor.
The January cohort starts January 11. Enroll by January 4.See the schedule
Course, module and lesson path above a page title, with the current page marked.
Home hero on ruled paper with a coded lesson window (rail, reading column, callout, practice question), plus page and course variants.
A six-week course for people who use numbers at work and want to trust them. Short lessons, a worked example in every one, and a practice question before you move on.
Next cohort: January 11 to February 19, 2027. Prefer your own pace? Self-paced access starts the day you enroll.
The lessons are the same in every plan. What changes is the schedule, the live sessions and who reads your capstone.
Section title in Literata with an optional lede and action; start-aligned, centered or split.
Each module ends with a short quiz, so you know you have it before the next one starts.
Every lesson follows the same shape: a question, a definition, a worked example, one exam tip, and practice.
Sheets of paper: plain, linked, ruled index card and desk variants with icon, meta and footer.
Twelve to twenty minutes each, with your place saved, so a lesson fits between two meetings.
A study note on axes, windows and denominators, with the fix for each.
Dividing a sample's squared deviations by n − 1 instead of n corrects its habit of guessing the spread too small.
A six-column grid of study tools, each cell with a coded mini interface in a desk well.
Definitions, worked examples, exam tips, common mistakes and things to remember always look the same, so skimming a lesson before a quiz takes a minute.
Each module ends with a deck. Flip, check, flip back.
See which days you studied and for how long. Missing a day costs nothing.
A ring per week shows what's done and what's next.
Real fractions and symbols, with every letter explained underneath.
Feature list with icon tiles, and alternating feature rows that pair copy with a coded visual.
Every lesson ends with questions that explain the answer, right or wrong.
Exercises come in Google Sheets and Excel versions. Python is optional, never assumed.
Thursday office hours and a cohort space where instructors answer within a day.
The lesson rail sits beside every lesson and shows what you've finished, what you're on and what's left in the module.
Course facts in big Literata numerals with a short label and note, tabular figures throughout.
A row of invented monogram marks for the open data sources the course uses.
Exercises use public data from
A quote from the school's own people: blockquote, initials avatar, name and role.
We kept meeting smart people who froze at a p-value. Not because the math is hard, but because nobody had taught it in the order you need it. Ridgeway is that order: describe, picture, estimate, then test.
Plan cards with price, inclusions and one primary action, a featured plan and a plain refund note.
All 34 lessons and quizzes, open for a year.
Six weeks with a group, a schedule and people to ask.
Five seats in a cohort for a team that learns together.
Not for you after the first week? Email us within 14 days for a full refund. No form, no questions.
Closing call to action on a desk sheet, or the single slate band per page, with a next-cohort line.
Read it, try the three practice questions, and see if the pace suits you. No account needed.
About 18 minutes, with a worked example and three questions.
Six Tuesdays of live sessions, office hours every Thursday, and feedback on a capstone built from your own data.
Enrollment closes January 4. Full refund within 14 days.
Native details accordion with plus marks, grouped by topic, keyboard and screen-reader friendly without JS.
No. You need arithmetic and patience. We use square roots and fractions, and every formula comes with a worked example and one plain sentence that says what it does.
A spreadsheet. Every exercise has a Google Sheets and an Excel version. Python notebooks are offered as an extra in weeks 4 to 6 and are never required.
Lessons stay open for a year after your cohort ends, and every live session is recorded. Week 5 is lighter by design, so there is room to catch up.
Long-form reading column in Literata: headings, lists, links, inline code, figures, tables, quotes and the highlighter.
A mean tells you where the middle of your data sits. It says nothing about how far the values stray from it.
Picture two sections of the same class. Both average 72 on the midterm. In the first, nearly everyone scored between 68 and 76. In the second, scores run from 44 to 98. The same mean hides two different classrooms, and that difference is what this lesson measures.
The range, highest minus lowest, is quick. It also depends on only two values, so one unusual score can double it. We want a measure that listens to every value:
A good summary number answers a question you were already asking.
In a spreadsheet, the sample standard deviation is STDEV.S(range). We'll compute it by hand once, so the function stops being a black box.
The callout taxonomy: definition, worked example, exam tip, common mistake and remember, each with its own bar, tint, icon and label.
Math set in text with real symbols: variables in italic, fractions, roots, sums and a where-list that names every symbol.
On-this-page list drawn as a rail: sections you have read are done, the one in view is in progress.
Author initials, name, role, date and reading time for notes and articles.
A vertical rail of dated entries for school history, changelogs and roadmaps, with progress marks for status.
Two new lessons and a worked example built on a medical screening test.
Optional notebooks that mirror every spreadsheet exercise, line for line.
A/B tests, sample sizes and when to stop a test early.
Labels, hints, inputs, selects, textareas, checkboxes and radios with focus, error, success and disabled states.
An on/off setting built on a checkbox with role switch, for reminders and preferences.
Radio or checkbox cards for picking a plan pace, a session time or study goals.
Search box with an icon, a clear button and a submit action, in default and large sizes.
Drop zone for assignment uploads with a file list, a drag-over state and an error state.
Email sign-up for study notes with inline validation and a polite success message.
Hairline data tables with tabular numerals, a compare variant with check marks, and labelled stacks under 640px.
| Module | Attempts | Best score | Status |
|---|---|---|---|
| 1. Describing data | 2 | 9 / 10 | Passed |
| 2. Picturing distributions | 1 | 7 / 10 | Passed |
| 3. Probability you'll use | 1 | 5 / 10 | Retake open |
| 4. Sampling and the normal curve | 0 | Not taken | Opens Feb 1 |
| What's included | Self-paced | Cohort | Team |
|---|---|---|---|
| All 34 lessons and quizzes | Included | Included | Included |
| Weekly live session | Not included | Included | Included |
| Capstone feedback | Not included | Included | Included |
Term and value pairs for course facts, certificate details and contact information.
Previous, numbered pages and next, with the current page marked and a gap for long runs.
Initials on four quiet tints in three sizes, and an overlapping group.
Inline status messages for info, success, warning and error, with an optional dismiss.
Short confirmations in a polite live region, raised from any button with data-sy-toast.
Native dialog for confirmations such as submitting a quiz, with a scrim, focus return and Escape.
Open questions count as missed. You can retake the quiz once after you see your score.
Glossary terms and icon hints that open on hover and focus and close on Escape; never hides essential content.
Half the values fall inside the The distance between the first and third quartiles: the middle 50% of the data., so outliers don't stretch it.
A dashed sheet that says what is missing and the one action that fills it.
Highlight a sentence in any lesson and choose "Save to notes". Your notes collect here, grouped by module.
Loading placeholders for cards and lists, with a slow shimmer that stops under reduced motion.
Labelled progress bars on native progress elements, and a segmented bar for weeks of a course.
An SVG ring for module and course completion with the percentage set in the middle.
Inline SVG bar, line and donut charts that read only the viz tokens, with HTML labels and a data table.
| Week | Minutes |
|---|---|
| 1 | 180 |
| 2 | 210 |
| 3 | 165 |
| 4 | 240 |
| 5 | 150 |
| 6 | 195 |
| Module | You | Median |
|---|---|---|
| 1 | 80 | 75 |
| 2 | 70 | 72 |
| 3 | 90 | 68 |
| 4 | 60 | 70 |
| 5 | Not yet | 74 |
| 6 | Not yet | 71 |
| Week | Study days | Minutes |
|---|---|---|
| 1 | 4 | 180 |
| 2 | 5 | 210 |
| 3 | 6 | 165 |
| 4 | 5 | 240 |
The signature: a sticky module rail listing lessons with not-started, in-progress and done marks, the current lesson highlighted by JS, collapsible on phones.
Lesson title with the module path, lesson number, time to complete, practice count and the objectives list.
Two data sets can share a mean and look nothing alike. This lesson gives you one number for how spread out values are, and has you compute it by hand once.
Inline practice question: choose, check, see why. Keyboard and screen-reader friendly; without JS the answer sits in a details element.
Two-sided review cards that flip on click, Enter or Space, with a crossfade under reduced motion and a scrolling deck.
Module accordion with week numbers, lesson counts, durations and the lessons as a rail with type icons and marks.
A course on a coded cover with weeks, level and price, or progress and the next lesson when enrolled.
Describe, picture, estimate and test, with a spreadsheet and plain words.
Axes, windows and denominators: the nine habits behind an honest chart.
Instructor sheet with initials, role, a short bio and office hours.
Spent eleven years as a survey statistician for a county health department, explaining confidence intervals to people who had a budget meeting in an hour. Writes Modules 1 to 3.
Taught introductory statistics at a community college for nine years and still grades every capstone by hand. Writes Modules 4 to 6.
Cohort calendar list: weeks with dated live sessions, office hours and deadlines, past ones marked done.
Previous and next lesson cards at the end of a lesson, with a mark-complete action.
Quiz question rail and the results panel: score ring, per-question marks and links back to the misses, kept live by JS.
4 still open. Check each answer as you go; the score fills in here.
A printable certificate of completion with a seal, signatures, a verification line and print styles.
This certifies that
Priya Raman
has completed Practical Statistics, a six-week course of 34 lessons, six module quizzes and a capstone analysis reviewed by an instructor.
Part of the Design Systems Library