B
Evidence Grade B
Graded
under review
Safe to Cite
Recent
75%
75% -- share of ab tests with 20pct or more engagement improvement for Buzz Education email subject-line A/B tests (education sector campaigns) (2025)
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
75%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Buzz Education
Primary
Tier B
https://www.buzz-education.com/blog/email-subject-line-ab-testing/ ↗
Source Article
How much difference can an email subject line really make | Buzz Education
How much difference can an email subject line really make?
Who is this article for?
This blog post is written for education suppliers who send email campaigns to schools and want to get more from their subject lines, using real A/B test data rather than general rules of thumb.
We spend a lot of time…
Original Research
Buzz Education
· Original study ↗
Methodology
Aggregate across Buzz Education subject-line A/B tests: 75% of tests improved at least one key engagement measure (opens/clicks) by 20% or more. Number of tests and exact period not stated; article gives no publication date, so collection-year approximation used.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Buzz Education email subject-line A/B tests (education sector campaigns): 75% share of ab tests with 20pct or more engagement improvement. Source: Buzz Education (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/buzz-75-percent-tests-20pct-gain
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<blockquote cite="https://lighthousedata.io/data/buzz-75-percent-tests-20pct-gain" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>75%</strong> -- share of ab tests with 20pct or more engagement improvement for Buzz Education email subject-line A/B tests (education sector campaigns)<br><small>Source: Buzz Education (2025) · <a href="https://lighthousedata.io/data/buzz-75-percent-tests-20pct-gain" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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