If the same result can be consistently achieved by using the same methods under the same circumstances, the measurement is considered reliable.
The consistency with which a method measures something is referred to as its reliability. The measurement is regarded reliable if the same result can be consistently obtained by using the same methods under the same conditions.
Assessing test-retest reliability entails administering the measure to a group of people once, administering it again to the same group of people later, and then examining the test-retest correlation between the two sets of scores.
When a scientist performs an experiment with a different set of people or a different batch of the same chemicals and has remarkably comparable results, that experiment is said to be trustworthy. Reliability is expressed as a percentage; if you get the same results every time, they are 100% reliable.
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