| A | B |
|---|
| accuracy | How close a measurement is to the true value |
| calibration | Marking a scale between known fixed points |
| data | A collection of measurements |
| datum | Singular measurement |
| random errors | These cause readings to be spread around the true value |
| systematic errors | All the readings are shifted |
| zero error | Type of systematic error due to false zero |
| evidence | Data which has been validated and supports a judgement |
| fair test | Only the independant variable is allowed to affect the dependant variable |
| precision | Depends of scale. Smaller scale units = more of this. |
| reliability | Means if the experment was done again you get similar results. Repetition increases this. |
| true value | Value with no measurement errors |
| validity | Data has this if the test is fair |
| variable | something about the experiment which can change |
| categoric variables | Use labels not numbers |
| continuous variables | Any numerical value is possible |
| control variables | Keep these constant for a fair test |
| dependent variable | The outcome - what you look at to see how it changes |
| independant variable | The input -what you deliberately change |
| discrete variable | Whole numbers only |
| ordered variable | ranked categories e.g. small, medium, large |
