What determines the precision of a measurement?
Precision is a measure of how specific you measurement is. Or, in other words, the repeatability. There are two concepts in measurement: precision and accuracy. Accuracy is how close to the real value your measurement is. Precision is how narrow your measurement is. A measurement can be precise without being accurate and can be accurate without being precise. A good measurement is both. Let me give you an example to clarify. Imagine you wanted to measure the distance between your house and your neighbor’s house. One method would be to know how long your typical stride is and then walk between houses, counting strides. This method is reasonably accurate, since the answer will be reasonably close to the correct value. But, it is not precise. You couldn’t really tell the difference between 3.7 steps and 3.8 steps. So your measurement doesn’t give a very specific number. Furthermore, the size of your stride varies step to step, so if you were to repeat the measurement, you might get differ
