Reliability, on the other hand, involves making sure that the measurements of the test are consistent each time it is conducted. Therefore, validity applies to the chosen measures of the variables and whether or not they are indeed applicable to the purpose of the experiment. Ferrell (n.d.) states that “Validity is the extent to which the construct measures what it says it is measuring” (para. The validity of a test is an entirely different concept that concerns not only the results of the study but the overall design and performance. In other words, a reliable test or experiment is the one that provides consistent results every time that it is conducted, with only minor deviations acceptable. According to the most popular definition, reliability measures the extent to which an experiment or any other process that involves measuring procedures will yield the same results if repeated trials are carried out (Ferrell, n.d., para.
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