|Summary:||The main objective of this thesis was analyze the psychometric properties of Test of basic concepts Boehm-3 in a sample of 350 kids of first and second grade of primary of Fe y Alegria in Lima Metropolitana. This investigation has diversity statistical analysis like validity related to the content, related to the internal structure of the punctuations and related to other variables and analysis of reliability, difficulty and discrimination were done. Likewise, a scale was elaborated for the sample. The results show reliability on the punctuations and sufficient validity, which indicates that the adaptation can be use in the education area for teacher and future investigations. The result indicates an Aiken’s V coefficient between .9 and 1 that evidences validity related with the content. Moreover, a mid-validity related to other variables has a Kendall’s Tau-b coefficient of .467; validity related with the internal structure show only 1 common factor with a 18.65% of explanation variance with the Hull method. Finally, a good reliability can be seen in the investigation with a .84 Alfa Cronbach coefficient.|
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