<p>I was one of the reviewers who vtc your question. But AFAIR, I thought the post was unclear and didn't provide enough information and material that could garner a quality based informative and concise answer.</p>
<p>Namely, there you wrote your product delivery time varies throughout the time. But how? (I see the same has been raised as a comment by <a href="https://stats.stackexchange.com/questions/627135/e-commerce-does-higher-delivery-time-lead-to-lower-sales#comment1169828_627135">dimitriy</a>). You said you want your test based on historical data. Well then at least provide a snippet of it! What does it contain? What's the format? Etc.</p>
<p>Then you asked for an example to show the purported test based on a toy historical data.</p>
<p>Overall, albeit the post could have to some extent a statistical query, the dearth of some useful information renders it unanswerable, imo. Of course, I think it can be salvaged provided you are able to reply to the response sought and supply some critical information necessary for an answerable query. That was my take of your post.</p>
<p>If others think differently, they can surely vote to reopen.</p>
