Adding the clinical framing, because it changes how the question reads. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.

roxy_nash said:

It is worth asking what the claim would look like if it were false.

Second this. Nothing to add that would improve it.

roxy_nash said:

It is worth asking what the claim would look like if it were false.

There is a second half to this that has not been said yet. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.

Adding the numbers, since they settle part of this. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.

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

How long did you give it before you decided it was working?