Different between Accuracy and Precision??
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What is the difference between accuracy and precision. Can you be one without the other? Give an example. What is the importance of each. Explain by using examples
Answer:
Accuracy: how close you are to the correct answer
Precision: how reproducible your results are.
Let's use exams scores
If you scored a 22%, a 20%, a 21% and a 19% on your 4 exams, you were NOT accurate (you were veeeerrrrrry far away from 100%!) but you can tell your mom your scores were reproducible, therefore you were very precise.
Conversely: if you score a 100%, a 90%, a 85% and a 95% you were not precise, your scores were all over the place, but you were very close to the right % (100% - your average score was 92.5%) which made you accurate but not precise.
If you score 100%, 100%, 99%, 97% you were both accurate (close to that perfect right answer) as well as precise - you scored practically the same thing over and over and over again.
Accuracy implies truth, or whether an answer or measurement is basically right, given a 'reasonable' margin of error.
Precision is the level of detail in the answer. Typically in science, it means the number of digits, especially after a decimal point.
For instance, you ask me how far it is to the next village. I tell you "About 5 miles". Or I could tell you "4.9323782347348" miles.
About 5 miles is a pretty accurate answer.
But 4.9323782347348 is both accurate, and a very precise answer.
I could also have said "13.29438754 miles". That would be very precise, but not all all accurate -- because the true distance is quite different from 13.3 miles, and not within a reasonable margin of error.
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