Psicometría 07 2012, Exámenes de Psicometría

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¡Pad + 17:39 6% + 07 A mail-attachment.googleusercontent.com E Ll) EN - Univer... 176000... 2, apu... 9 lider... 9 lider... Gmail 2012p... Googl... 2012p... ) 201... kentification number: Exercise 1. In a psychometric sbudy, we obtained that the vartance of the true scores was 20 and the standard dewiation of he emplrical scores was 5. Calculate the correlation between the errors and the empirical scores. Exercise 2. A library wanted to know which scientific joumaés were interesting to ranew next year. 10 participants (4-4) ordered, from 1 (the less usetul) to $ (the most useful), 5 journals. Order thern from tive less to the most useful using tve metñod af ranking. ParticipantfPsicothema/Scientometrica[Calidoscopio Aute mjBloethics EN 2 3 EJ 1 5 B 3 d 1 5 2 E 2 3 5 1 El D 5 3 2 a 1 l dl 1 2 5 3 F 3 El 2 5 El G 1 2 3 d 5 H El 5 1 3 2 J El 3 1 5 2 A 3 1 de 5 2 Exercise 3. The concept LOWE was valued using an Osgood's semantic differential. The table below presents the number of participants that chose each category used in the bipolar acales to measure he dimension POWER. 134 Js|6/7 Weak-strong 10/5/15/30/20/15| 5 Fragile-stone| 1 (9/10/10) 6 [60] a Tender-hard | 2 (1/11/34) 6 [30/10 Calculate the factorial score of the dimension POWER. Exercise 4. The table below presents the answers given to an ltem by 400 participants. From 3 options, the correct answer was "C”. Each walue represente the frequency of participants who selected each option, divided in three groups: the 25% of participants that obtained thve highest scores in the test; the 25% that obtained the lowest scores; and the central 50%. AB The highest 25% | 5 [25 Intermediate 50% /J60|70 The lowest 25% [44/31 ejejs|2 a. Calculate the corrected index of difficulty and interpret the result. b. Calculate the index of discrimination (0) and interpret the result.