Norm and Standardization Study for Naglieri Nonverbal Ability Test, 5-9 Age Group

Area of Science:

• Psychometrics
• Developmental Psychology
• Educational Assessment

Background:

• Intelligence is a complex construct, not directly observable, necessitating standardized assessment tools.
• Nonverbal ability tests provide a means to evaluate intellectual capacity without relying on language proficiency.
• The Naglieri Nonverbal Ability Test (NNAT) is a tool designed for assessing nonverbal intelligence.

Purpose of the Study:

• To evaluate the psychometric properties of the Naglieri Nonverbal Ability Test (NNAT) in children aged 5-9.
• To determine the reliability and validity of the NNAT for assessing general intellectual ability.
• To compare NNAT performance with other established intelligence and developmental screening tests.

Main Methods:

• A general survey model was employed, with 753 children from diverse socioeconomic regions participating.
• Data were collected using the Naglieri Nonverbal Ability Test (NNAT), Test of Nonverbal Intelligence-3, Colored Progressive Matrices Test, and Denver II Developmental Screening Test.
• Reliability was assessed using Cronbach's Alpha, test-retest, and parallel forms. Validity was examined through correlational analyses with other tests.

Main Results:

• The NNAT exhibited high reliability, with an average reliability coefficient of .88.
• Strong correlations were found between NNAT forms (r=0.93) and test-retest analyses (0.87, 0.88).
• Significant correlations were observed between NNAT and the Colored Progressive Matrices Test (r=0.84) and Test of Nonverbal Intelligence-3 (r=0.52).

Conclusions:

• The Naglieri Nonverbal Ability Test (NNAT) is a reliable and valid instrument for intelligence assessment.
• The NNAT effectively measures general intellectual ability and reasoning skills in the 5-9 age group.
• Findings support the use of the NNAT as a valuable tool in educational and psychological evaluations.