Difference between reliability and validity

Reliability and validity seems to be synonymous, but they do not mean the same thing. They are actually different things, different terms when they are explained in a technical manner.
Reliability is when your measurement is consistent. It means if you are using a certain kind of instrument for a test and the results on the subjects you are testing is the same for the first and second try, then it is considered reliable. If reliability is more on consistency, validity is more on how strong outcomes of the hypothesis are. It answers the questions 'are we right?' This means if there is a social experiment on a class concerning discipline and then after the experiment the class became more disciplined, then the strength of the conclusion is very strong. This means the validity too is strong.
There are some of the differences between reliability and validity and reliability is more on the consistency of a measurement, while validity is focused more on how strong the outcome of the program was. Reliability is easy to determine, because validity has more analysis just to know how valid a thing is. Reliability is determined by test and internal consistency, while validity has four types, which are the conclusion, internal validity, construct validity, and external validity. Validity looks at accuracy while reliability looks at repeatability. There can be reliability without validity while  there cannot be validity without reliability. Reliability mainly focuses on maintaining consistent result and validity mainly focuses on the outcome.

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