accuracy. precision how closely the group of data are in relation to each other
estimation
Precision
There are two ways to work out the real difference mean in science. Firstly, the real difference means when the ranges for two different values do not overlap. If they do overlap, then there may not be a difference in the true value. Secondly, if there is a real difference, the range of one value should not overlap the mean of another value.
At present, that would be the yoctogram, simply because "yocto-" is the smallest submultiplier. You could, of course, compound the prefixes, as "centimicroyoctogram," but the real value of such units is dubious; almost anything you needed to weigh would be more than a yoctogram.
The Newton (N) named after Sir Isaac Newton the first real physicist in my book.
Real science conforms to accepted norms of the scientific method. Pseudoscience, or other self-proclaimed 'sciences' do not conform and therefore are not really science.
"Absolute value" means how far a number is from zero.* In the case of real numbers, just remove the minus sign if there is one. The absolute value of 5 is 5; the absolute value of -5 is also 5. * In the case of complex numbers, the Pythagorean theorem is used.
Accuracy
Precision: how close measurements are to each other Accuracy: how close measurements are to the "true" or accepted value. If you do 3 trials of an experiment and you get 1.00 grams, 1.01 grams, and 1.03 grams as your answers but the real value was supposed to be close to 6.79 grams, your data was precise but not accurate.
not a real unit of measurement
scale
Yes, time is real. It is the measurement of duration.
Scale
An estimate is just a guess. A measurement tells you the real number (of whatever kind of measurement you are making).
Facts
He accepted the transfer to Real Madrid.
The real measurement for 2 by 4 by 8 is 64. This is a math problem.
Although as numbers they are the same value, the real meaning may be different. A measurement of 3.2 meters can be a rounded value from 3.15 to 3.24 meters while 3.20 meters may represent a rounded value between 3.195 and 3.204.
It is the scale ratio or scale factor