Describe how you'd implement an A/B test for a landing page headline
WHAT IT TESTS: Experiment integrity beyond DOM swaps. ANSWER OUTLINE: Mention deterministic bucketing, anti-flicker rendering, tracking with variant IDs, and sample-size planning. RED FLAG: Swapping headlines client-side after paint biases data and hurts UX.
WHAT IT TESTS: Whether you understand end-to-end experiment integrity rather than just front-end DOM manipulation. ANSWER OUTLINE: A strong answer covers deterministic bucketing for sticky assignments, anti-flicker rendering to prevent layout shift, instrumenting exposure and conversion events with variant metadata, and pre-defining statistical significance or minimum sample size. RED FLAG: Swapping the headline with client-side JavaScript after the page paints, which introduces bias, invalid attribution, and a poor user experience.
Read the original → optimizely.com
- #ab-testing
- #experimentation
- #frontend
- #analytics
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