| Term | Definition |
|---|---|
| variable | factors or things that are changed in an experiment |
| independent variable (IV) | the factor that is purposely changed by the experimenter; the "I change" factor |
| levels of independent variable | changes that are made in the independent variable |
| dependent variable (DV) | the factor that responds |
| hypothesis | a prediction about a relationship between the IV and the DV, written as an If… Then… statement |
| constants | all factors that remain the same and have a fixed value |
| control | the standard for comparing experimental effects |
| repeated trials | the number of experimental repetitions, objects, or organisms tested at each level of the independent variable |
| title | a statement describing an experiment or data table, written in the form of: "The Effect of Changes in the Independent Variable on the Dependent Variable" |
| experimental design diagram | a diagram that summarizes the IV, DV, constants, control, number of repeated trials, hypothesis, and title |
