PREDICTION OF VOCATIONAL SUCCESS 195
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Scores in Test IX, Part 10
Figure 26: Scores of successful and unsuccessful comptometer operators in
two tests, illustrating the use of critical scores in a combination of two
tests. Critical scores are indicated in the chart by intersecting lines. It is a
favorable indication if an applicant scores above 30 in Test VI and also
above 59 in Test IX, Part 10. Data from Bills (9, Dp. 282).
of the ratio of the difference in proportion to its standard
error; but this procedure is seldom worth the additional
labor (57). (See also pages 201-202.)
Once the questionnaire has been scored, critical scores and

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