| A | B |
| variable | anything that can change in an experiment |
| independent variable | the thing that is changed on purpose in an experiment |
| dependent variable | the thing in an experiment that changes as a result |
| constants | the things in an experiment that are kept exactly the same |
| control | standard for comparison |
| hypothesis | statement of the relationship of the independent variable to the dependent variable |
| repeated trials | used to reduce the chance of errors |
| qualitative data | data collected from verbal descriptions or rating scales |
| quantitative data | data gathered from counts or measurements |
| no treatment control | the experimental setup in which nothing is changed |