UGC NET Questions (Paper – 1)

A directional hypothesis states both the existence and the direction of a predicted difference or relationship, such as claiming that one teaching method will produce higher achievement than another. Because it specifies which group will perform better, it allows the use of one-tailed significance tests. Such hypotheses arise when theory or prior research provides a clear expectation about the direction of effect. Hence, the hypothesis described in the stem is correctly termed directional.

Option A:
A directional hypothesis narrows the focus of testing by indicating exactly how groups are expected to differ, for example that experimental scores will exceed control scores. This explicit direction has implications for how critical regions are set in statistical tests. The stem clearly refers to predicting which group will score higher, so this option fits precisely.

Option B:
The null hypothesis usually states that there is no significant difference or relationship between groups and does not specify any direction of difference. It serves as a baseline assumption to be tested rather than a directional claim.

Option C:
A non-testable statement cannot be examined through empirical data because it is too vague or abstract, so it does not function as a proper hypothesis in scientific research. This is the opposite of carefully specifying a directional prediction.

Option D:
The term statistical hypothesis is a general label for any hypothesis formulated for testing with statistical procedures and may include both null and alternative forms. It does not necessarily imply direction, so it is too broad for completing the stem.

The null hypothesis is a formal statement used in statistical testing that assumes no real effect, no difference or no association exists in the population between the variables under investigation. It serves as the default position that the researcher attempts to challenge with sample data. If the evidence is strong enough, the null hypothesis is rejected in favour of an alternative hypothesis. Because the stem specifies a hypothesis asserting no difference or relationship, it is clearly describing the null hypothesis.

Option A:
A research hypothesis (or alternative hypothesis) expresses the researcher’s expectation that a particular relationship or difference does exist in the population. It typically predicts a specific direction or pattern of effect. Since the stem states that the hypothesis asserts no difference or relationship, research hypothesis is not the correct term.

Option B:
Null hypothesis plays a central role in significance testing, where statistical procedures estimate the probability of obtaining the observed sample results if the null hypothesis were true. A low probability leads to rejection of the null, suggesting that a real effect may exist. The definition in the stem aligns directly with this idea, confirming null hypothesis as the correct answer.

Option C:
A directional hypothesis predicts not only that a difference or relationship exists but also the direction of that effect, such as one group scoring higher than another. It is not the hypothesis of “no difference” but rather one of specific difference. Therefore, directional hypothesis cannot complete the stem properly.

Option D:
Working hypothesis is a tentative assumption that guides early stages of investigation and may or may not be stated in statistical terms. It need not assert the absence of a relationship; instead, it often suggests a possible effect to be explored. As a result, working hypothesis does not match the definition given in the question.

A directional hypothesis predicts the specific direction of an expected relationship or difference, such as stating that Method A will produce higher achievement than Method B. It leads to one-tailed statistical tests because the researcher is interested in deviations in a particular direction. This type of hypothesis is based on prior theory or evidence suggesting how results should differ. Since the stem mentions a hypothesis that specifies both existence and direction of difference, directional hypothesis is the correct term.

Option A:
A null hypothesis asserts that there is no significant difference or relationship between variables in the population. It does not predict a direction and often serves as the default assumption in significance testing. Therefore, null hypothesis does not fit the description in the question.

Option B:
Non-directional hypotheses merely state that a difference or relationship exists without indicating which group will score higher or what the direction of association will be. They correspond to two-tailed tests that consider both positive and negative differences. Because the stem emphasises specifying direction, non-directional hypothesis is not appropriate.

Option C:
A directional hypothesis can be more powerful statistically when correctly specified, but it also carries risk if the true effect is opposite in direction. It is justified when prior research strongly suggests a particular outcome. These features align closely with the stem’s description, so directional hypothesis is the right completion.

Option D:
A working hypothesis is a tentative assumption that guides the early stages of research and may or may not be directional. It is a broader term and does not necessarily indicate the explicit direction requirement highlighted in the stem. Hence, working hypothesis is not the best answer.

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.