Should a researcher expect more tests to be both perfectly reliable and perfectly valid?

Answer :

Understanding the distinctions between validity and reliability is crucial. Professional test developers frequently have greater success obtaining high validity than high reliability.

Reliability describes how reliable a test score will be, whereas validity describes how useful a test is in a certain context. If you aren't certain that the test is dependable, you can't make any meaningful inferences from the results.

Validity is concerned with a measure's correctness, whereas reliability is concerned with its consistency. Particularly in quantitative research, reliability and validity should be taken into account while developing your study design, selecting your methodology, and summarising your findings.

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