[Karunamon]

Why does a hypothesis need to be defined by the scientific method?

Because a thing which you believe and yet is not defined by the scientific method (or rather, empiricism) is known as "faith", a concept which you and the rest of this thread has spent a good deal of energy attacking.

[Nursie]

A hypothesis is not something that you believe though, it is something subject to test.

[Karunamon]

And yet before you test it (if you get around to testing it, and you have the ability and resource to do so), it's just another thing you believe might be the cause of some effect.

In other words, it has no empirical base. It's an idea. A thought, held in the belief that some future action by you or others may prove it correct.

[Nursie]

Sure, it's an idea, it's not something you believe anything about though, that's a fundamental misunderstanding of the concept. A hypothesis is a statement of a possibility to be investigated and either upheld or invalidated. It is in no way equivalent to a belief.

[Karunamon]

I'm not seeing the substantial difference between those two things, aside from the unrelated-to-my-point variable of how much the idea-holder wants it to be upheld.

That variable certainly exists - it's why we have blind-controlled trials as the gold standard of research.

[Nursie]

Surely that's the whole point of a belief - here is something I know to be true.

As compared to a hypothesis - here is an idea that should be tested by investigation, I make no prior judgement to its truth

[Karunamon]

(oops!)

I don't think a true null hypothesis exists as long as humans are involved in concocting them, the person could want, consciously or subconsciously, any output from any experiment.

Maybe one outcome leads to more research that's a major paint to secure funding for and one is much easier? Maybe the outfit funding the study clearly wants one particular result?

Which goes right back to what I'm saying: humans are not purely logical, true null hypotheses don't exist, and the only difference between a "hypothesis" and a "belief" by what you just described is the degree to which the person with the idea wants a specific outcome - a variable which is completely unrelated to the eventual truthiness or falsity of the output.

[Nursie]

--edit-- I can't help feeling we've wandered off-piste here.

The point I was trying to make is that the origin of a hypothesis is not really important, just that before it is accepted as true or false it is tested.

--edit-- this wasn't actually an edit so much as a reply. Oops!

[crististm]

The underlying issue is that having faith in Empiricism(1) is reasonable but having faith in God is ignorance.

Quoting Hamming: "A man was fishing with a net in the sea. He concluded that there is no smaller fish in the sea than what he caught". (s/fishing net/scientific method)

(1)Empiricism modulo quantum effects - and here we go again.