Your significance test has probably never been checked against a known answer.

Preview text: Your significance test has probably never been checked against a known answer. Most…

Tuesday, Aug 4, 2026 at 3:54 AM EasternMailchimp

SPEEROYour significance test has probably never been checked against a known answer.

Image not available

No image available for this email.

Subject: Your significance test has probably never been checked against a known answer.
Preview text: Your significance test has probably never been checked against a known answer. Most…
From: martin@speero.com
Brand: SPEERO
ESP: Mailchimp
Sent: Tue Aug 4, 2026, 3:54 AM ET
Sent to: landingpagemakeover.com, markitekt.com, speero.com
Size: 60 KB
Images: 10
Links: 16, 4 of them buttons
Subject length: 78 characters

Against SPEERO's usual

Sent in the 3 AM hour, which holds 9% of its emails; 16% arrive in the 3 PM hour. The subject is 78 characters; its average is 57.

Email headers

What the brand's servers put on this email. Our receiving servers, the address we subscribed with and unsubscribe links are left out.

From: S P E E R O <[email protected]>
Reply-To: …@inbound.mailchimpapp.net
Subject: Your significance test has probably never been checked against a known answer.
Date: Tue, 4 Aug 2026 07:54:27 +0000
Message-ID domain: mail248.atl221.rsgsv.net
Return-Path domain: mail248.atl221.rsgsv.net
DKIM signature: d=speero.com s=k3
List-Unsubscribe: Present, one-click
Mailer: Mailchimp Mailer
Feedback-ID sender: mc

from mail248.atl221.rsgsv.net [198.2.139.248] by our receiving server with ESMTPS
from localhost [127.0.0.1] by mail248.atl221.rsgsv.net with ESMTP

Other sending headers (names only): X-Campaign, X-campaignid, X-Report-Abuse, X-MC-User, X-Auto-Response-Suppress, X-Accounttype

	Aug 20, 2026 3:03 AM	A/B Testing Was Never Supposed to Decide for You
	Aug 19, 2026 8:29 AM	You already run experimentation. You're just not running it on AI.
	Aug 6, 2026 3:04 AM	37 Experimentation Tools, Verified. Tell Us Where We Got It Wrong.
	Aug 4, 2026 3:54 AM	Your significance test has probably never been checked against a known answer. (this email)
	Jul 31, 2026 6:09 AM	Your Significance Test Has Never Been Asked to Prove Itself
	Jul 30, 2026 3:31 PM	Welcome to Experimentation Revolution
	Jul 23, 2026 12:35 PM	AI didn't remove developers from testing. It removed the queue