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| How small a measurement is. Millimetres are more precise than centimetres because they are smaller. |
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| How close a measurement is to its true value. |
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| Errors caused by factors we can’t control, like tiny temperature changes in a room. They can also happen if you make a mistake – like pushing the stopwatch button too early. |
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| Errors caused by inaccurate equipment, equipment that doesn’t zero properly or by problems with a method. |
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| If someone else can repeat your measurements and get the same results then your results are reliable. Carrying out repeat measurements checks the reliability of your results. |
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Definition
| The variable you change to see what happens. |
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Definition
| The variable that you measure. |
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Term
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Definition
| An investigation or experiment where only the independent variable has been allowed to affect the dependent variable. This means only changing one variable and keeping everything else the same. |
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Term
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Definition
| Your results must be valid if you are going to be able to draw a conclusion from them. To get valid results you need to carry out a fair test. |
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| Variables that can have any numerical value. You should use a line graph to show this type of data. |
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Term
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Definition
| Variables that are described by labels. You should use a bar chart to show this type of data. |
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