Technical Report - International Military Testing Association

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Analysis
A bivariate distribution ~58 prepared betwoen readability level,
shown on the horizontal axis in intervalt of 3, and ric, shown on the
vertical axis, in intervals of .lO.
Correlational analysis to detect nonlinear r&%tfanshipr of one
sample produced nonsignificant results.
The ric was cmputed for each column of the scatterplot. E5ch
column represent5 different levels of reEdability ic intervals of 2,
e.g., 2-3, 4-S, etc., through 22-23, 24-25, etc.
The items of the teat were divided in several way8 on the basis of
readability level. The-tic was computed for items above a certain readability
level, and the ric was computed for iteXM below this level. If
the former is lower than the latter the sigcificance of the difference
was tested. A one-tailed te8t was used. Degrees of freedom for each
ric vas taken aa the number of i:ezns included in computing the ric times
N-3 of the validation sample. In other word5, each item contributes
N-3 degree5 of freedom. .
The critixal readability level WBR tnken oa that diviafon point which
yields the largest s score or critical ratio betaeen the ricls obtained
for the two parts of the test.
The yic’s so obtained were also tested for significant deviation
from zero.
To dete,rcsults have been obtained in four MOS. Results for two
of these are shown in the following tables. These two MOS include
some 40,000 EM.
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