Resolved: Sample Standard Error
In 4.2.+Population+variance+known,+z-score_exercise the solution to Standard Error uses the population standard deviation to calculate it. Isn't the standard error calculated with the sample's standard deviation?
Can you please clarify?
1 answers ( 1 marked as helpful)
Please note that In this case, we know the population standard deviation. This is why we can use it.
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Why the way of calculating STD error and STD error of difference is different?
If we know stdev from the sample and they're different, how do we assume variances are equal?
Is it a must that the population sample has to be normally distributed to work with student T dist?