Question: Thank you so much, that's the answer I've got. Just a quick question regarding the Z crit value. I calculated Z crit = Z 0.05

Thank you so much, that's the answer I've got.

Just a quick question regarding the Zcrit value. I calculated Zcrit = Z0.05 = -1.645. I got this value using the normal statistical tables:

From the normal tables, Z0.05 is not stated.

Calculate Z0.05 by using values for Z0.0495 and Z0.0505 and take average of the two.

Zcrit = Z0.05 = [(-1.64) + (-1.65)] / 2 = -1.645

Therefore, we will reject H0 if Zobs > -1.645.

Why is Zcrit always positive for a right tail test? And is Zcrit always negative for a left tail test then?

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