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Is it true that an answer is as precise as the most precise measurement from which it was calculated?
Wiki User
∙ 8y ago
No. An answer is only as precise as the least precise measurement from which it was calculated.
Wiki User
∙ 8y ago
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Is the following sentence true or false to decide whether a measurement has good precisions or poor precisions the measurement must be made more than once?
True!
True or false most elements are nonmetal?
Most elements are metals.
Are grams and liters the same?
grams per liter is a measurement of density. A milliliter is a measurement of volume. They are not the same.
Most of the elements are solids true or false?
True
Are most of the elements solids true of false?
True
What unit means the smaller the unit used the more precise the measurement?
While the statement is true, there is no unit with that meaning.
What detemines the precision of a calculated result based on measurement?
The precision of any measurement comes from the equipment being used, instruments that can measure in smaller increments are more precise, as they can measure closer to the true value. For example if you used a ruler to measure the thickness of a wire, you may get a result of 2mm, but if you measure the same wire with a micrometer you may get a result of 1.8mm - the micrometer can measure in smaller increments, so the result is more precise.
Why you consider only rms value of voltages and currents in ac circuits?
RMS is most commonly used measurement for AC because the power calculated from it matches the power calculated from DC and is the true power, if there is no phase shift. Its not the only measurement, just the most generally useful. Other measurements are still useful for purposes other than power calculation.
Is precision refers to how close a measurement is to the true or accepted value?
No. accuracy is a measure of how close the measurements are to the true value.
What does a negative percentage error means?
A percentage error is 100*(measurement - true value)/true valueThe percentage error is negative if the measured (or calculated) value is smaller that the true value.
How does accuracy differ from precision a scientific measurement?
Accuracy is the tendency for a measurement to be correct. A more accurate measurement will be closer to the true value than a less accurate measurement. Precision is the tendency to come to the same measurement under the same conditions on multiple occasions. A precise measurement may not be accurate, but can be reproduced time after time and give the same (or sImilar) result.
What is a measurement close to true size?
A measurement close to true size is referred to as Precision Measurement.
What is a group of precise measurements?
A group of precise measurements are a group of repetitive measurements that are very close together. Ie the standard deviation between the measurements is small. Not to be confused with a accurate measurement! Think about it like this, if you measure a piece of wood 5 times and each time you get an identical answer then the measurement are said to be precise. If however if turns out that despite measuring the length 5 times and getting the same answer you discover that the length is significantly off from the "true" answer, then you were inaccurate!
Is it true that most scientist report results of their research using the English system of measurement?
No it's not true. The vast majority of scientific reports use the S.I. metric system of measurement.
How is it possible to get three precise but inaccurate measurement of the same volume of water?
Definition of Precision: Referring to how close a group of measurements are to each other. Accuracy: Refers to how close the measurement is to the true or accepted value. If the volume of the water was 20 L and I measured it wrong one and got 19, measured it again and got 19, and then measured it a third time and got 19, that would be a PRECISE measurement, since you got the same result three times in a row. It's INACCURATE because it isn't the CORRECT measurement. Hope that helped!
Why would it be important for your lab results to be both accurate and precise?
A group of precise measurements are a group of repetitive measurements that are very close together. Ie the standard deviation between the measurements is small. Not to be confused with a accurate measurement! Think about it like this, if you measure a piece of wood 5 times and each time you get an identical answer then the measurement are said to be precise. If however if turns out that despite measuring the length 5 times and getting the same answer you discover that the length is significantly off from the "true" answer, then you were inaccurate!
Can observation be accurate but not precise?
Accuracy, precision, repeatability and so on are terms that have been closely defined for measurement purpose. By folk such as ASTM. and ISO.The true value is the value towards which a large number of different measurements (by different measurement teams, using different measuring systems ... ..) tends.The accuracy of a particular method or measurement is how closely that answer comes to the True Value.The precision of a measurement represents the confidence you have in the measurement. (Generally by making several measurements.)The resolution of a measurement is merely the number of figures in your answer. A number with many places would have greater resolution, but many of those numbers might be meaningless.So, a single measurement of the height of a mountain for example, might be correct, (true value) but you don't necessarily have reason to be confident of the answer.
