Uncertainties and practical work Flashcards
Define validity
A measurement is valid if it measures what it is supposed to be measuring
Define True value
The value that would have been obtained in an ideal measurement
Accuracy
A measurement result is considered accurate if it is judged to be close to the true value.
Define precision
A quality denoting the closeness of agreement (consistency) between values obtained by repeated measurement
Define Uncertainty
The interval within which the true value can be considered to lie with a given level of confidence or probability
Define Error
The difference between the measurement result and the true value
Define Resolution
The smallest measuring interval and the source of uncertainty in a single reading.
How do you calculate percentage uncertainty?
Percentage uncertainty = (Uncertainty of measurement/Measurement taken) × 100%
What is the uncertainty when measurements are added together?
The sum of he absolute uncertainties
What is the uncertainty when measurements are multiplied together?
The sum of the percentage uncertainties
