The effect of time upon variability,
by Ella Woodyard.

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Main Author: Woodyard, Ella, 1878-
Language(s): English
Published: New York city, Teachers college, Columbia university, 1926.
Subjects: Educational tests and measurements.
Note: Published also as Teachers college, Columbia university, Contributions to education, no. 216.
Vita.
Physical Description: v, 56 p. incl. tables. 23 cm.
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