# Accuracy VS Precision: Difference, Example

## Accuracy and Precision

### What is Accuracy?

Accuracy tells how close a particular measurement is to the correct value.

Example: Suppose you are measuring the temperature of a body with a thermometer. Accuracy defines how close is the reading of thermometer to the actual temperature

### What is Precision?

Precision is the consistency of a repeated measurement.

Same Example: If you take multiple temperature readings one by one, are the readings consistent ?. The more consistent the readings are, the more precise the thermometer measurement is.

## Accuracy VS Precision EXAMPLE

Suppose the original weight of a body = 50 kg.

Now we are using a weighing machine to calculate the weight of this body, and try to find about the accuracy and precision of the weighing machine. We take 5 measurements one by one

Scenario 1 readings: 50, 50, 50, 50, 50

Readings = Actual temperature —–> Machine is Accurate

All Readings show same value ——-> Machine in Precise

Scenario 2 readings: 46, 46, 46, 46, 45.5

Readings Not Equal to Actual temperature —–> Machine is In-Accurate

All Readings show almost same value (though incorrect) ——-> Machine in Precise

Scenario 3 readings: 49.5, 50, 50.5, 50, 49

Readings almost equal to Actual temperature —–> Machine is Accurate

All Readings show different values (though close to original) ——-> Machine in Imprecise

Scenario 4 readings: 40, 53, 47.5, 50, 48

Readings Not equal to Actual temperature —–> Machine is In-Accurate

All Readings show different values ——-> Machine in Imprecise