Difference between revisions of "Precise"
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: The smaller the [[range]] and [[uncertainty]] the greater the '''precision'''. | : The smaller the [[range]] and [[uncertainty]] the greater the '''precision'''. | ||
: '''Precision''' is achieved by [[Control Variable|controlling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. | : '''Precision''' is achieved by [[Control Variable|controlling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. | ||
| − | : An [[ | + | : An [[reading]]s can be made more [[precise]] by removing sources of [[Random Error|random error]]. |
===Accuracy vs Precision=== | ===Accuracy vs Precision=== | ||
Revision as of 17:05, 20 April 2019
Contents
Key Stage 4
Meaning
Results are precise if the same reading or measurement repeatedly gives a similar value.
About Precision
- The smaller the range and uncertainty the greater the precision.
- Precision is achieved by controlling variables so that readings are stable over a long period of time.
- An readings can be made more precise by removing sources of random error.
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. | |||||
Key Stage 5
Meaning
Results are precise if the same reading or measurement repeatedly gives a similar value.
About Precision
- A single reading may be more precise if the resolution of the measuring instrument is higher. This is due to the upper and lower bounds of a single number being smaller when the number has a greater resolution. A ruler that measures to the nearest 1cm has an uncertainty of ±5mm for each reading. A ruler that measures to the nearest 1mm has an uncertainty of ±0.5mm, making a single reading more precise.