Correct answer:
Precision is a measure of reproducibility. If multiple trials produce the same result each time with minimal deviation, then the experiment has high precision . This is true even if the results are not true to the theoretical predictions; an experiment can have high precision with low accuracy.
Is it possible to be accurate and not precise give an example?
You can also be accurate but imprecise . For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.
Is it possible to be accurate not precise?
Accuracy refers to how close a measurement is to the true or accepted value. ... 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. The best quality scientific observations are both accurate and precise.
Are there any circumstances under which an accurate measurement may not be precise?
It is not possible to have many accurate measurements that are also not precise. When you are accurate, you must be getting the correct answer on each trial. Otherwise, you are not accurate, and when you are not accurate on each trial, you are thus not precise (consistent) either.
Is it better to be precise or accurate?
Accuracy is something you can fix in future measurements. Precision is more important in calculations. When using a measured value in a calculation, you can only be as precise as your least precise measurement. ... Accuracy and precision are both important to good measurements in science.
What is precise but not accurate example?
Precise, but not accurate: A refrigerator thermometer is read ten times and registers degrees Celsius as: 39.1, 39.4, 39.1, 39.2, 39.1, 39.2, 39.1, 39.1, 39.4, and 39.1. ... The thermometer isn’t accurate (it’s almost two degrees off the true value), but as the numbers are all close to 39.2, it is precise.
Can a measurement be 100% accurate?
No measurement is infinitely precise . There are many reasons for this. One fundamental reason is that an infinitely precise measurement of a quantity (say the temperature) would be some number T = 23.43284731..... that never, ever ends, so would require an infinite memory to store.
What causes low accuracy but high precision?
In a laboratory situation, high precision with low accuracy often results from a systematic error . Either the measurer makes the same mistake repeatedly or the measuring tool is somehow flawed. ... This demonstrates high precision and high accuracy. Scientists always strive to maximize both in their measurements.
Which is better poor accuracy or poor precision?
Accuracy refers to how closely the measured value of a quantity corresponds to its “true” value. Precision expresses the degree of reproducibility or agreement between repeated measurements. The more measurements you make and the better the precision, the smaller the error will be.
What type of error arises from poor precision?
Poor accuracy results from systematic errors . These are errors that become repeated in exactly the same manner each time the measurement is conducted.
Can a measuring instrument be precise but inaccurate Can it be accurate without being precise?
Yes, an instrument can be precise without being accurate but the measurements cannot be accurate without being precise.
Are the measurements valid and reliable if they are precise but not accurate?
A measurement system can be accurate but not precise, precise but not accurate, neither, or both. For example, if an experiment contains a systematic error, then increasing the sample size generally increases precision but does not improve accuracy.
Why would a researcher get accurate but not precise data?
Note that measurements can also be accurate, but not precise. In the above example, if Dr. Smith obtained measurements of 63, 64, and 62.5, these would be accurate because they are close to the person’s true height, but not precise, because they lack consistency .
How do you know if something is accurate or precise?
Accuracy is how close a value is to its true value . An example is how close an arrow gets to the bull’s-eye center. Precision is how repeatable a measurement is. An example is how close a second arrow is to the first one (regardless of whether either is near the mark).
What is difference between precise and accurate?
Accuracy is the degree of closeness to true value . Precision is the degree to which an instrument or process will repeat the same value. In other words, accuracy is the degree of veracity while precision is the degree of reproducibility.
Who is a precise person?
someone who is precise is always careful to be accurate and to behave correctly . Synonyms and related words. Careful and cautious.
