Question: How do we know if a test is two tailed or one tailed? for example if H null: p1 - p2 = 0 and H

How do we know if a test is two tailed or one tailed?

for example if H null: p1 - p2 = 0

and H alternative: p1 - p2 < 0

Is it two tailed or one tailed?

Also what is the rejection rule with the p value approach and the critical value approach in this case?

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