1 tailed vs 2 tailed tests..

How do you tell difference between 1 tail and 2 tail tests? I just threw up a little bit in my mouth.

If the question is asking whether or not a coefficient is equal to 0 (or some other value), it is a 2 tailed test. If it is asking whether or not a coefficient is greater than a specific value, it is one tailed. T-test is always 2 sided and F-test is always 1 sided.