Difference between revisions of "Precise"

Revision as of 09:15, 25 March 2019

Results are precise if the same reading or measurement repeatedly gives a similar value.

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.

Experimental Measurements of pi
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
The number pi is 3.14159265359 correct to 12 significant figures. 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.

@@ Line 8: / Line 8: @@
 ===Accuracy vs Precision===
-: The number [[pi]] is 3.14159265359 correct to 12 [[Significant Figures|significant figures]].
 {| class="wikitable"
@@ Line 42: / Line 41: @@
 |-
 | style="height:20px; width:100px; text-align:left;" colspan = "6"|
+: The number [[pi]] is 3.14159265359 correct to 12 [[Significant Figures|significant figures]].
 Method 1: The most [[accurate]] [[measurement]]s because they are the closest to [[pi]] but they are not very [[precise]] because they have a [[range]] of 0.26.