P values?
Do they account solely for sampling error (therefore irrelevant when population data is available) OR do they serve to asses the likelihood of something being due to chance in other ways (therefore relevant for studies with population data)?

Any links or literature are welcome :)

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  • arandomthoughtEnglish
    2·
    1 year ago

    Careful there. If you had a census of ALL the people in your population then you would not expect any variation, as you wrote. But not because of random sampling, but because next time you sample, you would just sample the exact same people (your whole population). And since the sample stays the same, so do the numbers.

    If you however truly took a random sample of the population, then the next time you take a new random sample you ask different people and would therefore also get slightly different numbers. And there p-values are useful, because they are based on exactly this question of “well what if I took another random sample, and then another, and then another and so on”.