| A | B |
| hypothesis | Educated guess/explanation |
| data | Information collected during an experiment |
| conclusion | Interpretation of experimental results (e.g., Was the hypothesis correct?) |
| variable | any part of an experiment that could change |
| control | the "normal" situation or procedure |
| replicate | testing on more than one subject (all subjects being similar) |
| fair test | changing only one thing at a time in an experiment |
| reproducibility | getting the same results by following the same procedure |
| qualitative observation | observation made using one or more of the five senses |
| quantitative observation | an observation made by counting or measuring |
| materials | substances in an experiment that are used up |
| apparatus | things like equipment or tools used in an experiment (they are not "used up") |