SandraNC_45 said:

The part it does not cover is what to do when the honest answer is "not enough data", which is more often than anyone likes.

Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.

SandraNC_45 said:

The part it does not cover is what to do when the honest answer is "not enough data", which is more often than anyone likes.

Adding the part of the answer the thread has not reached. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.

Adding the numbers, since they settle part of this. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

One thing that is still open after SandraNC_45’s answer:

How would you tell the difference between that and the alternative explanation?

SleepDoc_PDX said:

Practical: whatever you change, write down the date and the reason.

I do not accept the framing. The question has been narrowed to the version that has a tidy answer, and the part that was dropped is the part the OP actually asked about.