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Data Analyst interview questions

A data analyst interview tests whether your numbers change decisions. The hiring manager listens for how you frame a vague question, how careful you are with data quality, and whether a non-technical person would understand your conclusion.

Questions to expect

  1. Tell me about an analysis that changed a decision.

    What they listen for

    The decision first, then the finding, then what the business did. If nothing changed, the answer is about a report, not an analysis.

  2. A stakeholder asks 'why are sales down?' Where do you start?

    What they listen for

    Clarifying questions before queries: down compared to what, since when, for whom. Then a short order of things to check.

  3. Describe a time the data was wrong or incomplete.

    What they listen for

    How you noticed, how you measured the damage, and how you told the people who had already used it.

  4. How do you explain a result to someone who does not like numbers?

    What they listen for

    One sentence, one chart, one comparison they already know. An example of a time it worked.

  5. Tell me about a dashboard you built. Who uses it, and how do you know?

    What they listen for

    That you checked usage and removed what nobody looked at.

One answer, before and after

Tell me about an analysis that changed a decision.

You said

I did a big analysis on churn, looking at lots of variables like usage and plan and region, with cohorts and everything. I made a deck with all the charts and presented it to the team and they found it really interesting.

Try

Marketing wanted to discount all annual renewals. I showed that 70 % of churn came from customers who never invited a second user in their first month. We dropped the discount and added an invite step to onboarding instead. Churn in the next cohort fell from 9 % to 6 %.

The decision, the one finding that mattered, and the result, in that order.

What a report scores for this role

Problem framing
You turn a vague question into one that data can answer.
Rigour
You say what you checked and what you are not sure of.
Storytelling
Your conclusion comes first, in plain words.

Examples: each report picks the competencies that fit the role and the interview.

Rehearse this interview out loud

Reading these questions is a start. Saying your answers to someone who follows up is the rehearsal.

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