= involves the manipulation of an independent variables to measure the effect on the dependent variable.
Hypotheses
= clear, precise, testable statement that states the relationship between the variables to be investigated.
directional hypothesis= states the direction of the difference or relationship.
non-directional hypothesis= does not the state the direction, only that there will be a difference.
independent variable
= some aspects of the experimental situation that is manipulated by the researcher or changes naturally so the effect on the dependent variable can be measured.
