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
| Method | Test 1 | Test 2 | Test 3 | Average | Range |
| Method 1 | 3.27 | 3.09 | 3.01 | 3.12 | 0.26 |
| Method 2 | 3.91 | 3.88 | 3.88 | 3.89 | 0.03 |
| Method 3 | 3.57 | 2.89 | 2.93 | 3.13 | 0.68 |
Method 1: The most accurate measurements because they are the closest to pi but they are not very precise because they have a range of 0.26. Method 2: These are the least accurate measurements because they are the furthest from pi but they are very precise because they have a range of only 0.03. Method 3: Each measurement is not accurate because they are far from pi, they are also the least precise because they have a range of 0.68. However, the average is the most accurate as it is the closes to pi. | |||||