Product: Testimonials on Product Page
Hypothesis
If we add customer testimonials to product pages, then purchase conversion rates will improve because authentic peer reviews reduce uncertainty and validate the purchase decision
Test Results
Key Learning
Context: Users on the product need validation from others before committing — without visible proof of success, they hesitate.
What was tested: Customer testimonials provide authentic social validation that reduces purchase uncertainty; their effectiveness scales with relevance, specificity, and credibility of the reviewer profile This large-scale test (1,317,945 visitors) provides strong statistical confidence in the directional findings.
Result: No statistically significant difference was detected. Inconclusive social proof tests often mean the proof type or placement didn't match what users need at that moment. Try a different format or position.
How to Apply This to Your Site
This experiment tested product: testimonials on product page but produced no statistically significant change. The test was run on a product page page in the cross-industry industry. Inconclusive results suggest this particular change may not be a priority — focus testing effort on higher-impact areas.
Before you test: Consider that social proof tests typically require large sample sizes to detect small effects. Run your test for at least 2 full business cycles to account for weekly traffic patterns.
What Was Tested
In this experiment, the presence of customer reviews were A/B tested on product pages of an online grocery store. Impact on adds to cart and sales was measured. (The expert was ran as a reverse/removal, but was inverted here to match the pattern).
Methodology
Build On These Learnings
Save your own experiments, spot winning patterns across your test history, and stop repeating what's already been tried.
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