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

The aim of the present study was to test the Naglieri Nonverbal Ability Test for children in the 5-9 age group and to determine the psychometric attributes of this tool. Intelligence is a complex and abstract concept. Therefore, it is not possible to observe or measure directly. However, it helps experts to have an idea about the intelligence levels of people with the evaluation scales used. Nonverbal ability tests are also one of the assessment scale types used for this purpose.

The study was conducted based on the general survey model. One district from each socioeconomic development region was selected via random assignment taking as a basis the socioeconomic development listing for the districts. The study was carried out with 753 children from 4 different socioeconomic development regions. Naglieri Nonverbal Ability Test, Test of Nonverbal Intelligence-3, Colored Progressive Matrices Test, and Denver II Developmental Screening Test were used for data collection. Cronbach Alpha reliability, test-retest reliability, and parallel form reliability were calculated during Naglieri Nonverbal Ability Test reliability analyses. For validity analysis, the level of correlation between Naglieri Nonverbal Ability Test and Test of Nonverbal Intelligence-3 and Colored Progressive Matrices Test tests was examined.

It was determined that Naglieri Nonverbal Ability Test has high reliability with an average reliability coefficient of .88. High correlation was observed between the A and B forms of Naglieri Nonverbal Ability Test A (r = 0.93, P < .001) and during the test-retest analyses (0.87, 0.88). A statistically significant difference was determined between the Naglieri Nonverbal Ability Test scores and class level and age group, while a statistically significant difference could not be determined based on gender. A high, positive, and statistically significant correlation was determined between Naglieri Nonverbal Ability Test and Colored Progressive Matrices Test (r = 0.84, P < .001), whereas a moderate, positive, and statistically significant correlation was determined between Naglieri Nonverbal Ability Test and Test of Nonverbal Intelligence-3 (r = 0.52, P < .001).

The findings illustrate that Naglieri Nonverbal Ability Test is a valid and reliable intelligence test for measuring general intellectual ability and for assessing reasoning skills.