DataBeginner
Statistics without the proofs
Harbor School of Data · Course
18,900 learners, rated 4.6
$49
DataIntermediate
A/B tests you can defend
Size a test, fix the metric before launch and read the result without fooling yourself.
Rated 4.8540 reviews8,720 learners
Taught by Ibrahim Salah, verified instructorML engineer · logistics · Northline Institute- Length
- 5 weeks at 3 hours a weekAt your own pace, or in a live cohort
- Credential
- Earn a course certificateIssued by Northline Institute
- Language
- Taught in EnglishWith subtitles in 6 languages
- Tutor
- An AI tutor in every lessonIt answers from the lesson on screen
$69once, yours to keep
Or in Waypoint Plus for $29 a month
Enroll for $69Start lesson one freeYour money back within 30 days
Start
About this course
You finish with a one-page results memo for the most skeptical reader in the room, the one who asks how long the test ran. The examples come from the checkout, pricing and onboarding tests a product team runs most.
Skills you practice
Syllabus
4 modules
Ends on the project
13 lessons
7 to 18 min each
2 h 41 min of video
Pause to ask the tutor
2 free lessons
Watch before you pay
3 quizzes
15 questions in all
1 project
Reviewed by Ibrahim's team
- 1.2Sample size and the effect you can detect10 min
- 1.3Guardrail metrics that stop a bad launch12 min
- Quiz · 5 questions9 min
- 2.2Why peeking on day three misleads you17 min
- 2.3Sample ratio mismatch and other broken tests8 min
- Quiz · 5 questions6 min
- 3.1Confidence intervals on a lift11 min
- 3.2Segments: finding effects without inventing them7 min
- 3.3Novelty effects and tests that need longer15 min
- 3.4When the answer is no difference15 min
- Quiz · 5 questions9 min
- 4.1A results memo on one page9 min
- 4.2Deciding what a flat result means for the roadmap18 min
- 4.3Keeping a log of every test you ran16 min
- Project · Plan, size and read out a checkout test, then defend it2 hours
What the price covers
In the price
- 13 video lessons, 2 h 41 min in all
- The AI tutor beside every lesson
- 3 quizzes, graded as you answer
- A project reviewed by Ibrahim's team
- A course certificate when you finish
- Transcripts in 6 languages
Not in it
- Answers the tutor writes for you
- Live reviews outside a cohort
- One-to-one mentoring
- A job guarantee
Your instructor
Ibrahim Salah, verified instructor
ML engineer · logistics
- Rating
- 4.7
- Learners
- 46.9K
- Courses
- 3
10 years in machine learning
I build demand and routing models for a logistics firm.
Career highlight
My routing model cut empty truck miles by a fifth.
How Ibrahim teaches
I teach the statistics that tell noise from news.
Reviews, rated4.8540 reviews
Overall rating
- 5 stars, 86% of reviews
- 4 stars, 9% of reviews
- 3 stars, 2% of reviews
- 2 stars, 1% of reviews
- 1 star, 1% of reviews
Carlos M.Finance associate
2 months agoFinished
The tutor would not hand me the answer, which annoyed me for a week. It is also why I could do it alone in my interview last month.
Sofia R.Analyst, insurance
3 months agoFinished
The reviewed project got me the interview, and talking it through got me the job. I shared my screen on the call and took them through it.
Maya T.Analyst, logistics
3 weeks agoFinished
Two courses in, I still froze at a blank screen. Here every lesson ends with something you write, and the tutor asks what you expect.
Greg P.IT support
3 months agoFinished
Too slow at the start for anyone who already writes code. It picks up in the second half, but I nearly gave up on it in the first week.
Amara N.Nurse, moving into data
4 months agoFinished
I started without knowing what a CSV was. Ibrahim never assumed I knew anything, never made me feel slow for asking, and answered every question I posted, even the ones I was embarrassed to ask. By week six I was using what I learned at work, and my manager has since moved me onto the reporting team, where I build the weekly figures for every ward.
Jonas W.Operations lead
1 month agoFinished
Ibrahim pointed at one step in my project and asked how many rows it should return. In five years of spreadsheets, I had never asked myself that.
6 of 540 reviews
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Enrolling
What people ask before they enroll
A person answers anything this list does not. Ask us.
Enough of the basics to follow along without stopping to look things up. Lesson one is free, so open that first: if its practice set feels routine to you, you are ready for the rest of the course.
Nothing expires. 5 weeks at 3 hours a week is the pace the course was planned at, and at an hour a week it takes 15 weeks. The panel above works out a finish date for whatever pace you give it.
A start date, a finish date and a live review of the week's work every Thursday, with the same 30 people from the first week to the last. The lessons and the tutor are the ones the self-paced track gets.
A certificate from the school that made the course, and the project the instructor's team reviewed. Each comes with a link that anyone, an employer included, can open and check in a few seconds.
Yes, within 30 days of enrolling, from your account page and with no form to fill in or reason to give. Lesson one is free with the tutor, so most people know the course suits them before they pay.
Waypoint Plus is $29 a month and opens this course along with every other. At $69 this one costs about 2 months of it, so buy it on its own if it is the only course you mean to take this year.
Watch lesson one tonight. Decide in the morning.
It opens with the tutor beside it and the practice set under it, and asks for no card. The other 12 lessons are $69 once, or part of Plus.
Your money back within 30 days.
