Dataford
Interview QuestionsInterview GuidesExperiencesCoaching
New
Pricing
Get started
Dataford
Popular roles
Software EngineerData AnalystData ScientistData EngineerBusiness AnalystAI EngineerMachine Learning EngineerProduct Manager
Browse
Browse All RolesEvery role hub, from analyst to MLBrowse All CompaniesCompany-specific interview loopsAll Interview GuidesThe full guide library
Top questions by role
Software EngineerData AnalystData ScientistData EngineerBusiness AnalystAI EngineerMachine Learning EngineerProduct Manager
Top questions by skill
SQLPythonStatisticsMachine LearningA/B TestingSystem DesignGenerative AIProduct SenseMetricsBehavioral
Browse all questions →Try a mock interview
Experiences
Practice
Mock InterviewsTimed interview simulations with feedbackCoaching1:1 coaching with people at your target companiesSuccess PathYour 6-week structured planModulesCurated lessons by topicWebinarsTalks from ex-Big Tech data leadsPlaygroundA free-form scratch editor
Learn
BlogInterview strategy and career adviceTech Job Market ReportHiring trends across data and AI rolesFor UniversitiesDataford for career centersAbout DatafordWho we are and how we build
Pricing
Build my plan

A/B Testing Approach

HardA/B Testing & Experimentation00:00
Practice interviewer
In session
5 left
00:00

Your question is A/B Testing Approach. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

You need to log in / sign up to chat or submit.

Problem

How would you test a feature with A/B testing?

Asked in the culture fit stage. Treat this as a practical design exercise and make your assumptions explicit rather than waiting for a predefined product context.

  1. State the null and alternative hypotheses, primary metric, MDE, and guardrails.
  2. Choose the randomization unit and explain the allocation and duration.
  3. Show a sample-size calculation using clearly labeled illustrative assumptions.
  4. Describe the pre-registered analysis plan, including peeking, multiple comparisons, and SRM checks.
  5. Give a ship, do-not-ship, or iterate rule and identify important risks.