Difference between revisions of "Accurate"
(→About Accuracy) |
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: [[Accuracy]] is achieved by: | : [[Accuracy]] is achieved by: | ||
:*Removing [[Systematic Error|systematic errors]] from the [[reading]]s. | :*Removing [[Systematic Error|systematic errors]] from the [[reading]]s. | ||
| − | :*Removing [[Zero Error|zero errors]] by [[Calibration|calibrating]] [[ | + | :*Removing [[Zero Error|zero errors]] by [[Calibration|calibrating]] [[Measuring Instrument|instruments]] before the [[investigation]]. |
:*[[Control Variable|Controlling]] all the [[variable]]s except for the [[Independent Variable|independent variable]] and the [[Dependent Variable]]. | :*[[Control Variable|Controlling]] all the [[variable]]s except for the [[Independent Variable|independent variable]] and the [[Dependent Variable]]. | ||
: If there are [[Random Error|random errors]] and a small [[Sample Size|sample size]] taking [[repeat]] [[readings]], removing [[anomaly|anomalies]] and calculating an [[Mean Average|average]] can improve the '''accuracy'''. | : If there are [[Random Error|random errors]] and a small [[Sample Size|sample size]] taking [[repeat]] [[readings]], removing [[anomaly|anomalies]] and calculating an [[Mean Average|average]] can improve the '''accuracy'''. | ||
Revision as of 12:38, 21 March 2019
Key Stage 4
Meaning
Results are accurate if they are close to the true value.
About Accuracy
- Accuracy is achieved by:
- Removing systematic errors from the readings.
- Removing zero errors by calibrating instruments before the investigation.
- Controlling all the variables except for the independent variable and the Dependent Variable.
- If there are random errors and a small sample size taking repeat readings, removing anomalies and calculating an average can improve the accuracy.
- If there are systematic errors or zero errors the results can be improved by finding the source of the error and correcting it.
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.