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Posted By : Tahir Siddiqui(Mani)
Reliability:-
Reliability
Is an indicator of a measure’s internal consistency. Consistency is the key to
understanding reliability. A measure is reliable when different attempts at
measuring something congregate on the same result. If a professor’s marketing
research tests are consistent, a student should tend toward consistent scores
on all tests. In other words, a student that makes an 85 on the first test
should make scores close to 85 on all subsequent tests. Another way to look at
this is That the student who makes the best score on one test will exhibit
scores close to the best score in the class on the other tests. If it is
difficult to predict what students would make on a test by examining their
previous test scores, the tests probably lack reliability. When a measuring
process provides reproducible results, the measuring instrument is reliable.
Validity:-
Validity
is the legality. legality is the precision of a measure or the degree to which
a score honestly speaks to a idea. Accomplishing legitimacy is not a
straightforward matter. The opening vignette portrays this point. The work
execution measure should reflect work performance. In the event that a
director's kinship influences the execution measure, then the scale's validity
is lessened. In like manner, if the execution scale is characterized as
exertion, the outcome may well be a solid scale however not one that boosts
legitimacy. Exertion may well prompt performance yet exertion likely does not
equivalent execution. Another case of a legitimacy inquiry may involve a media
scientist who ponders what it implies when respondents demonstrate they have
been uncovered to a magazine. The analyst needs to know whether the measure is
legitimate. The subject of substantiality communicates the analyst's worry with
precise estimation. Legitimacy addresses the problem of whether a measure (for
instance, a demeanor measure utilized as a part of showcasing) for sure
measures what it should gauge. Whenever a measure needs legitimacy, any
conclusions in view of that measure are additionally prone to be broken.
Understudies ought to have the capacity to relate to the following legitimacy
issue.
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