I think this is a one tail test,

H0: u=0

H1: u > 0

Am I correct?? thank you in advance..

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I think this is a one tail test,

H0: u=0

H1: u > 0

Am I correct?? thank you in advance..

Do not perform one-tailed tests. In the present case, it would be impossible to determine if

perhaps the effect is the other way around.

With kind regards

Karabiner

perhaps the effect is the other way around.

With kind regards

Karabiner

Could you explain more why you think we should use two sided t-test?

I was thinking that since the student in the question above specifically is looking for if northern USA "have more severe winter depression" than Southern USA our Ho has to be u= 0 and H1: u > 0

A working hypothesis which contains a direction does not imply a one-sided hypothesis.

You very rarely see this. Why? Because it seems un-scientific to make oneselfu voluntarily

blind on one eye. It is not impossible that an effect has the opposite direction.

With kind regards

Karabiner

You very rarely see this. Why? Because it seems un-scientific to make oneselfu voluntarily

blind on one eye. It is not impossible that an effect has the opposite direction.

With kind regards

Karabiner

Dang, now I want a doughnut.