Data from the Raven’s Standard Progressive Matrices (RSPM) pre- and post-tests of reasoning(n=1192; µ = 0.84) indicated a statistically significant difference (p=0.000) betweenthe pre- and post-tests scores, and between improvements in scores of the experimental andcomparison groups. The five sets of 12 problems (60 in total) were analysed separately to investigatethe levels of complexity of reasoning at which gains were made (the sets increaseprogressively in difficulty from sets A to E). Analysis of variance (ANOVA) of the Raven’sdata indicated that the greatest differences between the experimental group’s and comparisongroup’s mean gain scores were in sets A and B (p<0.001). The effect sizes were low, but werehigh enough to be considered of practical importance, that is, greater than 0.2. There was alsoa statistically significant difference (p<0.05) between the experimental and comparison groupsin Raven’s set D. No statistically significant difference between the experimental and comparisongroups was recorded in sets C and E (p=0.16 & 0.84, respectively).
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