Determining The Relationship Between Validity And Reliaability

Dr. L, Finding the right instrument to measure the variables being studied is very important. In fact, the instruments determine the quality of the research. There are two parameters used to assess the quality of an instrument and they are reliability and validity. Reliability is the ability of the instrument to measure a variable and obtain consistent and stable results when applied to similar conditions. The predictability and accuracy of an instrument strengthens its reliability (Tamilselvi & Ramamurthy, 2013). If an I.Q. Test consistently predicts the students academic performance in school, then one could conclude that the instrument is reliable in testing a students intellectual abilities. Validity is the appropriateness, meaningfulness, completeness, and utility of the instrument in measuring the variables being studied (Tamilselvi & Ramamurthy, 2013). For example, if one is trying to assess a patients knowledge on hypertension by using an instrument that asks questions about managing blood sugar, then the test would be considered an invalid instrument because the questions are not addressing the phenomenon of interest. Then, the validity of the results will be in question.
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(2013). Reliability and Validity in Nursing Research. Asian Journal Of Nursing Education & Research, 3(4), 270-272. Retrieved from