IB Internal Assessment (IA) Psychology Standard level (SL) 2026 May Solution & Worked Answer

Investigating the Effect of Word Length on Recall Accuracy within the Phonological Loop of the Working Memory Model

Solution Overview

This investigation tests the Working Memory Model by examining how word length affects recall accuracy within the phonological loop. The study hypothesizes that monosyllabic words will be recalled more effectively than five-syllable words due to the efficiency of the rehearsal mechanism.

Using a repeated measures design with 10 participants, the researcher compared recall performance across two word-length conditions. Data analysis included descriptive statistics and a Wilcoxon signed-ranks test, which yielded significant results (W=0, p < .05) supporting the hypothesis.

This exemplar is highly valuable for its rigorous application of inferential statistics, detailed evaluation of sampling and procedural limitations, and clear connection between empirical findings and cognitive theory.

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