When merging questions does the question with the lower popularity get merged into the more popular question?

Answer 1

When a Supervisor merges questions, it generally goes this way:

The less-grammatically correct question is merged into the more grammatically correct question. Or, the question that hasn't been on site very long, is merged into the question that has been here much longer.

The second question (the one that is being merged) becomes an alternative wording to the first question (primary question - the one that it is merged into).

Popularity, answers, alternative wordings, links, related questions, discussion pages, etc are merged together under the primary question. The truth is simply that the supervisor chooses which question to merge. They can then look to pick a different alternate as prime if they desire or even re word the prime question.