What ar the key terms in a verbal hypothesis that signify whether you are conducting a one–tailed or two-tail

Answer 1

greater than and less than; larger or smaller, etc.

If you use one of these, the test is one tailed (it can only be greater or less, larger or smaller). If you just say there will be a difference, it can be greater or less, making it two-tailed (can go in two directions)