Most of us like shooting arrows to the dartboard, targetting at the bull's eye, that is the center of the dartboard.
The closer the darts land to the bull's eye, the more accurate our aim will be. What is meant by precision then? When can you consider any measure precise?
Let's have a look!
Explore the simulation below and try to shoot the arrows towards the bull's eye.
Hope you enjoyed it!
Let's learn about accurate vs precise examples, accurate and precise definition, and accuracy and precision difference in detail.
Check out the interesting examples to know more about the lesson and try your hand at solving a few interactive questions at the end of the page, for quick revision.
What Is Meant by Accurate and Precise?
Our day-to-day activities are just incomplete without measurements.
From medical check ups to controlling temperature of appliances to sports and even cooking, all require measurements in some way or the other.
Measurements require tools, either conventional or unconventional.
Also, different people may get different results using the same instrument.
That further leads to measurements of any value being either accurate or precise.
Let's consider common accurate vs precise examples.
Let’s consider the value of pi, i.e, 3.1459265359
3.14 is a number for representing the value of pi, which is not precise but accurate, based on closeness. No other number with three digits can get closer to the target.
Accuracy of a number is given by the number of digits to the right of the decimal.
Precision is the maximum number of digits to the right of the decimal.
Answers may vary as two people might be considering different values.
Thus, accuracy and precision are two important factors to be considered while taking measurements. Both reflect how close a measurement is to a known or accepted value.
If you weigh a given substance five times and get 1.2 lbs each time, then your measurement is very precise but not necessarily accurate.
It's because you are getting values that are so close to each other.
Accurate and Precise Definition
Accurate is defined as the closeness of a value to its true value, such as the closeness of an arrow to the bull's eye at the center.
Accurate is correct, that is the bull's eye.
Precise is defined as the repeatability of the values of a measurement, such as the closeness of other arrows to the first one.
Precise is repeating, that is hitting the same spot, but that may not even be the correct spot.
Let's have a look!
What Is the Difference Between Accurate and Precise?
Let's explore the difference between the two.
Accuracy and Precision Difference
The degree of correctness to the true or exact value.
The degree of exactness to the values obtained each time.
The closeness of the measured value to a standard or true value.
The closeness of two or more measured values, to each other.
|Single measurement||Multiple measurements|
|For something to be accurate consistently, it must be precise.||Precision is independent of accuracy.|
Here are a few accurate vs precise examples. Let's have a look!
Jack, a snack foods manufacturer, produces bags of potato chips, each measuring 11 oz.
He tests the weight of the bags using a scale that measures the bags.
There is little variation in the measurements: 12.2 oz, 12.33 oz, and 12.13 oz, for three samples.
What does this tell about the scale?
Three samples = 12.2 oz, 12.33 oz, and 12.13 oz.
There is little variation in the measurements.
The scale measures the bags precisely, but not accurately.
|\(\therefore\) The measurements of the three samples are precise.|
Masurement of the mass of a 5 lbs standard sample.
(i) Values - 4.5, 4.6, 4.5, and 4.7 lbs
(ii) Values - 4.8, 5.1, 5.0, and 4.9 lbs
(i) Precise (there is little variation in the measurements)
(ii) Accurate (close to the true value)
\(\therefore\) (i) Precise
Annie has to check which set of data is more precise?
Look at the two given sets and help her.
Set A: 33.49, 33.47, 33.29, 33.40, 33.28
Set B: 16.80, 16.81, 16.90, 16.78, 16.85
In order to check which sets of data is more precise:
- Select the lowest vale and the highest value from each set
Set A = 33.49 - 33.28 = 0.21
Set B = 16.90 - 16.78 = 0.12
Since sample B has the lowest range, it's more precise.
|\(\therefore\) Data in set B is more precise.|
Here are a few activities for you to practice.
Select/Type your answer and click the "Check Answer" button to see the result.
The mini-lesson targeted in the fascinating concept of accurate vs precise. The math journey around cardinal numbers starts with what a student already knows, and goes on to creatively crafting a fresh concept in the young minds. Done in a way that not only it is relatable and easy to grasp, but also will stay with them forever. Here lies the magic with Cuemath.
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Frequently Asked Questions (FAQs)
1. Can measurement be both accurate and precise?
Measurements can be both accurate and precise, accurate but not precise, precise but not accurate, or neither, depending on the values.
2. Does precise mean exact?
Precise can be referred to as the exact value.
3. How can results be precise but not accurate?
Precision refers to how close measurements of the same item are to each other.
Precision is independent of accuracy.
That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise.