Non directional hypothesis form – UGC NET Question

A non-directional hypothesis asserts that two groups will differ or that a relationship exists but does not indicate the expected direction of the difference. It leaves open whether one group will score higher or lower than the other. In statistical testing, this type of hypothesis is usually examined with a two-tailed test because deviations in either direction are considered. Therefore, the form described in the stem is a non-directional hypothesis.

Option A:
A causal hypothesis specifically suggests cause–effect relations rather than merely any difference, and may or may not be directional, so it does not exactly capture the idea of leaving direction unspecified.

Option B:
A non-directional hypothesis is appropriate when theory or prior research is insufficient to predict which group will outperform the other, but evidence suggests that some difference is likely. This aligns with the stem, which notes that difference is predicted without stating which group is superior, making this option correct.

Option C:
A descriptive statement outlines characteristics of a single group or situation without comparing groups, so it is not about predicting differences at all. Hence, it cannot complete the stem.

Option D:
The null hypothesis states that there is no significant difference between groups, directly contradicting the assumption of a difference expressed in the stem. Thus, null is not the correct completion.