AN ASSESSMENT OF THE RELATIONSHIP BETWEEN RELIABILITY AND VALIDITY OF SOME SELECTED PSYCHOLOGICAL TESTS
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Journal of the Faculty of Science Obafemi Awolowo University, Ile-Ife, Nigeria
Abstract
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This study investigated the relationship of reliability and
validity. Three standardised psychological tests were
administered on 268 Nigerian secondary students spread over
forms one, three and five. The tests were administered twice
within a period of six weeks to allow for the computation of
test-retest reliability. The Cronbach's r, the Split-half r, the Spearman-Brown r and the Kuder-Richardson (KR) 20 r were
also derived. Content and construct validities were established
through Z-test, t-test, factor analysis and correlation
coefficient. It was concluded that when it is said that valid tests are reliable, it is the internal consistency reliability that is being referred to rather than the test-retest reliability. In essence, not all valid tests will necessarily furnish indices of reliability on all types of reliability coefficients. Apart from raising some issues for further study, the finding, has important implications for psychological tests' development and usage.
Keywords
BF Psychology, H Social Sciences (General)