We See These Every Week

After running 200+ A/B tests for clients, here are the mistakes that waste time and money.

Mistake 1: Testing Without Hypotheses

"This button should be blue" isn't a hypothesis. Frame it based on data and expected user behavior.

Mistake 2: Stopping Tests Too Early

You need statistical significance AND enough sample size. Wait for 95%+ confidence.

Mistake 3: Testing Too Many Variables

Control: Original. Variant: New headline + new button + new layout. Which change caused the lift? You won't know. Test one change at a time.

Mistake 4: Ignoring Mobile

70% of traffic is mobile on many stores. If you only test desktop, you're optimizing 30% of your business.