THE RELATIONSHIP ANALYSIS BETWEEN DISCRIMINANCY POWER AND VALIDITY OF ITEM TESTS

Abstrak / Ringkasan

Test is one common instrument, which used by most of college students who focus
on experimental study and also most teachers. Items test is arranged refer to learning
goal then its is tried out in an examination simulation for parralel leaners. Based on
learners’ answer, can be determined the level of item tes quality. There are four
description that must be contained by each item test, are proper difficulty index,
empirical validity, discriminancy power, and instruments reability. It was found
that tester got difficulty to choose one best quality item which contain these
description, because there is no sufficient information about criteria for a best
quality item test. Eventhough, applying bad quality item cause a bias for learning
result measured. Generally, this research aimed to provide an correlation facts
among some of these four item criteria, especially between discriminancy power
and validity. The population is test instrument for students at senior high school.
Twelves samples of test intrument have been chosen using purposive sampling. Data
analysed by using correlation technique of SPSS analysis, also descriptively. The
result of this study is dicriminancy power correlates toward item validity, with
determination coofecient start from 54.8% to 82.6%. Thus, each item description
is able to reflect another. Item which has higher discriminancy power value also has
higher validity item value.

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