Resolved: I don`t know whether to check one or two sided
in Statistics / p-value
when do I check one-sided p-value and when to check two-sided one?
1 answers ( 1 marked as helpful)
This depends on what your H0 and H1 are. If you have for example a situation in which H0 is that a variable (let's call it X) is 15 or less, while H1 is that X > 15, then you only want to use a one-sided test. However, if H0 is that X = 15, while H1 is that X != 15, you would use a two-sided test because in this case you don't care if it is higher or lower, just that it is different.
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can you explain why the last answer is the right one but not the first option???
If we know stdev from the sample and they're different, how do we assume variances are equal?