Difference between revisions of "Precise"
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===About Precision=== | ===About Precision=== | ||
: '''Precision''' is achieved by | : '''Precision''' is achieved by | ||
| − | :*Using [[instrument]]s with a high [[resolution]]. | + | :*Using [[Measuring Instrument|instrument]]s with a high [[resolution]]. |
| − | :*[[Control Variable|Controlling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. Sometimes [[reading]]s fluctuate so they cannot be recorded to as many [[Significant Figures|significant figures]] as the [[ | + | :*[[Control Variable|Controlling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. Sometimes [[reading]]s fluctuate so they cannot be recorded to as many [[Significant Figures|significant figures]] as the [[Measuring Instrument|instrument]] shows. |
===Accuracy vs Precision=== | ===Accuracy vs Precision=== | ||
Revision as of 12:39, 21 March 2019
Key Stage 4
Meaning
Results are precise if they given to a large number of significant figures.
About Precision
- Precision is achieved by
- Using instruments with a high resolution.
- Controlling variables so that readings are stable over a long period of time. Sometimes readings fluctuate so they cannot be recorded to as many significant figures as the instrument shows.
Accuracy vs Precision
- The number pi is 3.14159265359 correct to 12 significant figures.
- 3.1 is an accurate value for pi but it is not very precise - Close to the real number, but not many significant figures.
- 3.2111 is a precise value for pi but it is inaccurate - Not close enough to the real number, but has several significant figures.