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Explain what a p-value actually is, to me, and then to a customer's VP of Marketing.

Most working data scientists state the definition wrong, and interviewers know exactly which wrong versions to listen for. The correct one-sentence definition, the VP translation, and the three classic traps.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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UP NEXT ON YOUR JOURNEY

Next in this trackDesign an A/B test for a customer's new recommendation model. How long do you run it, and on how many users?Next in this trackThe customer checked the A/B dashboard daily and stopped the test the day it hit significance. What's wrong, and what do you tell them?Next in this trackThe customer can't randomize, every user must get the new model. How do you measure whether it worked?

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