Difference btw one sided test
What do I have to check to know if it is a one sided test or a two sided test?
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IMO. If the null hypothesis states that the mean population is "=" to a certain value, you may use the two-tailed test. If the population mean turns out to be significantly HIGHER or LOWER, you can reject the null hypothesis (Hence the name).
On the other hand, if it uses signs other than "=" like ">" or "<", you'll only need to prove that the population mean is either higher or lower (depending on the sign used) to reject the null hypothesis. (Only one side)
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can you explain why the last answer is the right one but not the first option???
Why the way of calculating STD error and STD error of difference is different?