A/B Testing & Experimentation

Five days on how to test a change, when the result is real, and when the numbers are fooling you. 25 modules, each one a finding plus a locked checkpoint.

modules

days

questions

tiers

$4.00

full course · lifetime

Buy course · $4.00 Start Module 1 free

What's included

01Foundations of A/B TestingDay 1 · 5 modules

What an A/B test compares and why businesses run them, how to turn an opinion into a question you can measure, what a primary metric is and what a guardrail metric protects, how to write a hypothesis that could come out false, and the parts every experiment is built from.

02Designing Reliable ExperimentsDay 2 · 5 modules

Why a control group is not optional, how users are split at random and why that matters, how many people a test actually needs before it can tell you anything, what statistical significance does and does not claim, and how to read a confidence interval and an effect size.

03Planning, Launching, and Running TestsDay 3 · 5 modules

How to write an experiment plan before anything ships, what to check before launch and what to watch after it, how long a test should run and why stopping early breaks it, and the biases that quietly make a result mean nothing.

04Analysing and Interpreting ResultsDay 4 · 5 modules

How to read a result without over-reading it, the difference between a change that is statistically real and one that is worth shipping, what a segment can and cannot tell you, why testing many things at once produces false winners, and what to do with a losing or inconclusive test.

05Applying and Scaling ExperimentationDay 5 · 5 modules

Experiments on a website and inside a product, experiments across advertising and email, when to use A/B/n or multivariate testing instead, how a team builds a programme that keeps testing, and one complete experiment from problem to decision.

Grading system

Every module ends in a checkpoint: two questions, locked the moment you answer — no retries, no second attempts. Across 25 modules that's 50 marks. Your Learn50 Score is the percentage you get right, and it earns a Tier you can put on LinkedIn or your résumé. A Tier starts at 40% — below that, the course records every module you finished and every question you sat. The credential is real because the test was real.

Diamond90% – 100%

Platinum80% – 89%

Gold70% – 79%

Silver60% – 69%

Bronze50% – 59%

Copper40% – 49%

Attempted

Every module finished and all 500 questions sat. A tier starts at 40%.

under 40%

Five days from now, you'll have a score.

$4.00 · lifetime access · 25 modules

Buy course · $4.00

Questions

Before you buy.

No. There is no eligibility requirement, no entrance test and no application — anyone can buy it and start. Every term is defined the first time it is used. No statistics background is assumed. If you have ever changed a page, an email or an advert and wondered whether it actually helped, you already have everything this course refers to.

No. The 5 days are a pace, not a deadline. Access is for life, so you can take 5 modules a day and finish in 5, or one a week and finish when you finish. Nothing expires and nothing is withdrawn if you stop for a month.

Every module ends in two questions worth one mark each — 50 marks across the course. Your Learn50 Score is the percentage you get right, and it earns a Tier: Copper from 40%, up to Diamond at 90% and above.

No, and that is deliberate. Each question locks the moment you answer it. If retakes were allowed, everybody would eventually score 100 and the number would mean nothing — the score is worth putting on a CV precisely because it cannot be ground upward.

At 40% and above, a certificate that is a web address rather than a file — anyone you send it to can open it and see the same score, date and certificate number that you see. Below 40% the course records that you finished every module and sat every question, marked as Attempted.

No, and it does not claim to be. It is a certificate from Learn50 recording a score on a test you sat once, with no retries. It is not accredited by any university and is not a substitute for one.

$4.00, paid once. There is no subscription, no renewal and no expiry, and no further payment at any point in the course. Every Learn50 course is priced at the same rate per module, so a shorter course costs proportionally less rather than more.

Yes — a full refund within 7 days of purchase, or until you complete the course, whichever comes first. Completing the course means finishing every module, at which point the certificate has been issued and the refund window closes.

What you get

Everything in the full course.

25modules

Across 5 days, five a day — about 30 minutes each.

50locked questions

Scored, one attempt each. No retries — so the score is real.

Score + Tier

A Learn50 Score out of 100 and a Tier, from Copper to Diamond.

Certificate

A verified Certificate from Learn50, at 40% and above — for your CV and LinkedIn.