What account for Reliability and Validity in research?

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According to the sample size of a research, what is the percentage of the sample size needed to assess the reliability and validity?

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Gershom Sackey

Reliability is the degree to which an assessment tool produces stable and consistent results whereas Validity refers to how well a test measures what it is purported to measure.

Aaron Agbenyegah Bedzo

Thanks so much for your response Gershon

Perpetual Ofori Abankwa

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Patrick Baiden

Interesting question following

Sharon Samevi

Interesting