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| Question | Answer |
| Uncertainty | The interval within which the true value can be expected to be found with a given level of confidence or probability, e.g. "the temperature is 20 degrees C and 2 degrees C at a level of confidence of 95% |
| Validity | Suitability of the investigative procedure to answer the question being asked. For example, an investigation to find out if the rate of a chemical reaction depended upon the concentration of one of the reactants was not controlled. |
| Valid Conclusion | A conclusion supported by valid data, obtained from an appropriate experimental design and based on sound reasoning. |
| Variables | These are physical, chemical or biological quantities. |
| Categoric | Categoric variables have values that are labels. E.g. names of plants or types of material. |
| Continuous | Continuous variables can have values that can be given a number either by counting or by measurement (e.g. light intensity, woodlice etc). |
| Reliable | A reliable measurement is one that stays the same after several repeats. |
| Repeatable | A measurement is repeatable if the original experimenter repeats the investigation using the same method and equipment and obtains the same results. |
| Reproducible | A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained |
| Resolution | This is the smallest change in the quantity being measured that can be detected by the measuring instrument. |
| Sketch Graph | A line graph that shows the general pattern between two variables without plotting the points. |
| True Value | This is the value that would be measured in an ideal measurement. |