**According to Evergreen Public Schools, the way to formulate a measurable hypothesis is to create an if, then and because statement in relation to two variables.** According to Wesleyan University’s Government Department, the four types of possible hypotheses to create are correlations, causal, directional and null. The type of hypothesis alters the formulation of the hypothesis.

A hypothesis is an observation about the way in which an entity works or behaves. A hypothesis is a proposed relationship that says that if the independent variable behaves in a certain way, then the dependent variable changes in a repeatable way because of a specific relationship. A null hypothesis states that one variable does not have a correlation or causal effect with another variable. A correlation hypothesis states that there is a relationship between the variables, but it is unknown which variable changes the other variable. A directional hypothesis accounts for this change with the addition of a possible positive, negative or negligible relationship between variables. A causal hypothesis explains that an independent variable or variables directly cause the dependent variable in a study. The causal hypothesis includes the “because” statement in the hypothesis.

A hypothesis must be testable to be valid. Researchers construct strong hypotheses after exploration of literature on a topic under consideration before asserting a new relationship.