Differentiate between test reliability and test validity.
Answer:
Validity and reliability are terms used in psychometrics to describe how well a test assesses something. When developing an assessment, businesses must examine the validity of the outcomes as well as their reliability or consistency throughout the testing process. The two notions are linked, yet there are significant distinctions that distinguish them.
Validity means that something measures what it is meant to measure. If a specific assessment is intended to identify whether or not applicants understand a set of compliance principles, it is said to be legitimate if it can reveal who knows the principles and who does not. Content validity, Construct validity and Criterion validity are the three categories of validity.
Something is reliable if it is consistent and repeatable. A trustworthy test must assess the same variables over and over again, providing the same or comparable results in each case. As an example: Sales assessments are used to measure candidates’ sales capabilities. If a given applicant took the same exam on many occasions and the business reached the same conclusions about their ability as a salesman, the test would be dependable. Test-retest, Interrater, Parallel forms and Internal consistency are the four types of dependability.
There are a few significant distinctions between validity and reliability:
Precision vs. consistency
Reliability indicates that something is constant over time but validity means that the test measures what it is designed to measure precisely.
Measurement
Reliability is easy to assess because it is based on a consistent set of findings. Validity, on the other hand, might be more difficult to assess. To demonstrate the validity of a test, the assessor must demonstrate that it measures what it is supposed to measure such as candidates who score well on this test also score well on other tests designed to assess the same thing.
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