What is directional research hypothesis?

Answer 1

A hypothesis in which the scientist predicts the direction of difference within two things being studied.

Ex: Apples are juicier than Pears.

Not directional: There is a difference in the amount of juice between apples and pears.

This is not directional because the scientist does not predict which fruit is juicier, only that they are not the same.

Answer 2

Consider the following example:

A: The mean height of all men in the city is 5' 6''

B: The mean height of all men in the city is greater than 5' 6''

B is a directional hypothesis because it specifies a direction ( greater than)

Similarly, if the hypothesis C were,

C: The mean height of all men in the city is less than 5'6'', it would also be a directional hypothesis.