What defines a Directional Hypothesis?

What defines a Directional Hypothesis?

• A. A hypothesis that predicts the direction of the relationship (increase/decrease).
• B. A hypothesis that has no specified direction.
• C. A hypothesis about causality only.
• D. A hypothesis used only in exploratory studies.

Answer: (A)

A directional hypothesis specifies the expected direction of the relationship between variables, such as an increase or a decrease. This means you’re predicting not just that a relationship exists, but whether one variable will go up while the other goes up or down, or vice versa. This clarity allows researchers to use a one-tailed statistical test, which concentrates the entire rejection area of the significance test in the predicted direction and thus has more power to detect an effect if the direction is correct. A directional hypothesis is typically grounded in prior theory or evidence, so the anticipated outcome is theoretically justified. For example, predicting that higher study time will lead to higher exam scores is directional because it specifies the expected positive direction. If a hypothesis merely states that a relationship exists without specifying the direction, that would be non-directional. And a statement about causality or something used only in exploratory work doesn’t define what makes a hypothesis directional.

A directional hypothesis specifies the expected direction of the relationship between variables, such as an increase or a decrease. This means you’re predicting not just that a relationship exists, but whether one variable will go up while the other goes up or down, or vice versa. This clarity allows researchers to use a one-tailed statistical test, which concentrates the entire rejection area of the significance test in the predicted direction and thus has more power to detect an effect if the direction is correct. A directional hypothesis is typically grounded in prior theory or evidence, so the anticipated outcome is theoretically justified. For example, predicting that higher study time will lead to higher exam scores is directional because it specifies the expected positive direction. If a hypothesis merely states that a relationship exists without specifying the direction, that would be non-directional. And a statement about causality or something used only in exploratory work doesn’t define what makes a hypothesis directional.