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it describes the main characteristics to be included in a good test
Characteristics of A Good Test
1. Validity:
The first important characteristic of a good test is validity. The test must
really measure what it has been designed to measure. Validity is often
assessed by exploring how the test scores correspond to some criteria,
that is same behaviour, personal accomplishment or characteristic that
reflects the attribute that the test designed to gauge.
Assessing the validity of any test requires careful selection of appropriate
criterion measure and that reasonable people may disagree as to which
criterion measure is best. This is equally true of intelligence test.
Reasonable people may disagree as to whether the best criterion measure
of intelligence in school grades, teacher ratings or some other measures.
If we are to check on the validity of a test, we must settle on one or more
criterion measures of the attribute that the test is designed to test. Once
the criterion measures have been identified people scores on the measures
can be compared to their scores on the test and the degree of
correspondence can be examined for what it tells us about the validity of
the test.
2. Reliability:
A good test should be highly reliable. This means that the test should give
similar results even though different testers administrate it, different
people scores in different forms of the test are given and the same person
takes that test at two or more different times. Reliability is usually
checked by comparing different sets of scores.
In actual practice, psychological tests are never perfectly reliable. One
reason is that changes do occur in individuals over time; for example, a
person who scores low in her group at an initial testing may develop new
skills that rise her to a higher position in the group at the time of the
second testing.
Despite such real changes, the best intelligence test usually yields
reliability correlation coefficient of 90 or higher (where 1.00), indicates
perfect correspondence and 0.00 indicates number correspondence
3. Objectivity:
By objectivity of a measuring instrument is meant for the degree to which
equally competent users get the same results. This presupposes subjective
factor. A test is objective when it makes for the elimination of the
scorer’s personal opinion bias judgment. The recognition of the quality
objectivity in a test has been largely responsible for the development of
an aroused and objective type tests.
Objective-based tests measure or evaluate the entire human development
in three domains that is cognitive, affective and psychomotor. As the
name itself indicates they are based on particular objective of teaching
and evaluating. They provide proper direction, and thus streamline the
whole process of evaluation. These tests are all comprehensives.
4. Norms:
In addition to reliability and validity good test needs norms. Norms are
sets of score obtained by whom the test is intended. The scores obtained
by these groups provide a basic for interpreting any individual score.
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