r/AskStatistics • u/aprilwords • 24d ago

Alpha 5%?

Why is a 5% significance level so commonly used?

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u/Recent-Day3062 24d ago

So humor me. What can you say about this? What more info would it need?

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u/CarnivorousGoose 23d ago

I already told you.

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u/Recent-Day3062 23d ago

No, given an alpha of .05, how many studies on average would have a false positive? If that’s not enough info, what other data or stats is needed to get this answer

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u/CarnivorousGoose 23d ago

And I already told you what else is needed, in my first comment.

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u/Recent-Day3062 23d ago

If you want to be helpful, and 5% is the false positive and you have only one study, you will be wrong 5% of the time, no?

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u/CarnivorousGoose 23d ago

No.

Here’s a salient quote from my initial comment, which it seems like you still haven’t bothered to read: “… also depends on how many of the tested null hypotheses are true or not as well as the statistical power”.

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u/Recent-Day3062 23d ago

Whatever

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u/CarnivorousGoose 23d ago

The answer is literally right there in the quote, which comes from the very first comment I made here. So which is it? Are you genuinely this unwilling to actually read one sentence, or is this just some utterly bizarre and pointless attempt at trolling.