Fox et al. (1987) used token economy with miners The yearly costs, adjusted for hours worked and inflation, resulting from accidents and injuries at the Navajo mine phase 1: Baseline 600,000 Costs (dollars) 300,000 phase 2: Token economy 0 1970 1975 1980 1985 Years Fig. 3.1
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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