Reliability of test:
The degree of consistency and stability a test exhibits in measuring its intended construct is known as the test reliability of test. In its most basic form, a test is dependable if it is constant both internally and throughout time. Imagine a bathroom scale that provided you with radically different readings each time you stepped on it, regardless of whether you had gained or lost weight. This is how test reliability works in general. Should such a scale be in existence, it would be deemed untrustworthy.
Validity of test:
The extent to which a test truly assesses the things it purports to measure is referred to as test validity. The degree to which judgments, inferences, and conclusions drawn from test results are reasonable and significant is another measure of test validity. The research conducted in 2000 and 2008 provides proof that the accountability tests that Ohio has imposed are invalid and that judgments and inferences based on OPT performance are not grounded on the test’s purported measurement objectives.
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The association between reliability and validity
Test usefulness is determined by two distinct standards: validity and reliability. Despite their differences, they cooperate. Creating a reliable test that didn’t measure what it was supposed to measure would not be advantageous. It is impossible to do the opposite, which is to properly measure what we want to evaluate using a test that has so many flaws that the results cannot be repeated. Validity must be accompanied by reliability. This implies that having validity requires having high dependability. Validity is constrained by reliability; a test cannot be valid if it lacks reliability. Validity establishment only begins with a strong dependability foundation. It is necessary to prove validity independently. Being able to measure something consistently is all that excellent reliability indicates; it does not imply good validity. It is now necessary for us to determine what it is that we are regularly measuring. It is important to remember that validity requires dependability not only reliability. To put it succinctly, dependability is the capacity to identify when validity is an issue.
Test reliability cannot occur without test validity. Reliability is meaningless if a test is not legitimate. Put differently, test validity is a prerequisite for any meaningful consideration of reliability, therefore it makes little sense to discuss reliability if a test lacks validity. Similarly, a test is invalid if it is not dependable. As such, dependability is not examined in the two Hoover Studies.
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