Concept of Validity
Validity
is concerned with how accurate the test measure and the appropriate of the test
for the subjects. Ary et al (2006:225) defines validity as the extent to which
an instrument measured what it claimed to measure. In other words, validity can
be defined as the instrument that measures what is supposed to be measured. In
this study, to ensure tests validity the researcher used construct validity,
content validity and face validity.
a. Face Validity
Face
validity refers to the surface of the test. It means that a test have to look as
if it measures what is supposed to measure (Isnawati, 2012:29).Face validity is
hardly a scientific concept, yet it is very important. A test which doesn’t have
face validity may not be acceptable by test-takers, teachers, education
authorities and employers. a song and they should fill the gaps based on the
song that they listened to. From
b. Construct Validity
A
test is said to have construct validity if it can be demonstrated that it measures
just the ability which is supposed to measure (Isnawati, 2012:29). Construct validity
is capable of measuring certain specific characteristics in accordance with
theory of language behavior and learning.
c. Content Validity
Content
validity refers to the validity which is seen from the content of the test as
the representation of language skills (Isnawati, 2012:27).It also means that there
is correspondence between curriculum objectives and the objectives being tested.
In other words, the objectives of the test are not outside from the curriculum
objectives that have been set by educational policy.
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