A/B Testing & Experimentation

Five days on proving whether a change worked, instead of arguing about it.

Before you take this course

English language proficiency is required to understand the teaching.
This is interactive, slide-based learning. Please take Module 1 free to check you are comfortable with the format.
Percentage and basic statistical understanding is recommended, because this course will ask you to read conversion rates, significance and confidence intervals — and decide whether a difference is real or noise.
Making notes and working through the formulas along the way is recommended.
This is not a coding course and not a tool tutorial. You will learn to design and read experiments, not to operate an A/B testing platform.
About 30 minutes of focused learning a day, closer to an hour if you make notes. Please take the course only if you have that time.

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.

Fivedays from now, you'll have a score.

$6.00 · lifetime access · 25 modules

Buy course · $6.00 Start Module 1 free

Why this course

Six things you can check before you pay.

25 findings, not 25 definitions

Every module ends in something quantified and slightly surprising — a number you did not expect, worked out in front of you. Nothing here asks you to memorise a term.

50 questions, one attempt each

Locked the moment you answer. No retries, no second attempts, no grinding a score upward. That is exactly why the score is worth putting on a CV.

About 30 minutes a day

5 modules a day across 5 days. Built for people with a job, on a phone, in the gaps — not for people with a free afternoon.

$0.24 a module

Paid once. No subscription, no expiry, and no upsell at the end. The same rate applies whichever Learn50 course you start with.

A credential anyone can check

At 40% and above you get a certificate that is a web address, not a file. Whoever you send it to opens it and sees the same score, date and number you do.

No prerequisites

No degree, no entrance test, no application. Every term is defined the first time it is used, and nothing assumes you studied this before.

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.

$6.00, 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 finish with

A certificate anyone can check.

There is no file to lose and nothing to forge. The certificate is a web address, and whoever you send it to sees the same score, the same date and the same number that you do.

Sample certificateName and scores used in this certificate are fictional.