20th Century Psychometrics

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Across
  1. 4. "Father of Modern Day Testing" - NCME
  2. 5. First president of the Psycohmetric Society
Down
  1. 1. the assignment of numerals to objects or events according to some rule
  2. 2. matrix' symmetric and positive semi-definite and its main diagonal contains variances.
  3. 3. Founder of psychophysics