Abstract
When the test items are of unequal difficulty, the 1953 Horst modification of the KR-20 should be used.
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References
1.
Guilford
J. P.
, &
Fruchter
B.
(1978 ) Fundamental statistics in psychology and education. (6th ed. ) New York : McGraw-Hill .
2.
Horst
P.
(1953 ) Correcting the Kuder-Richardson reliability for dispersion of item difficulties . Psychological Bulletin , 50 , 371 –374 .