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Category: Methods and Measures

Description: 160 to 190 subjects. The number is in part affected by external circumstances and practical limitations. Planned sampling method: 30 students from two courses recruit 6 participants each. Power estimate for between subjects ANOVA with 3 x 2 groups, alpha = .05, power = .80 and medium effects requires at least 158 subjects for the main effect of the 3-step-factor “Einstellung condition” and for the interaction between the two factors “Einstellung” and “Thinking mode”. Comparisons between the two conditions “Thinking aloud” and “Thinking silently” would require at least 128 subjects in order to detect medium effects. Expectations concerning effect sizes cannot by specified precisely.