A class of students were studying traffic flow at a busy road junction near their school. A sketch map of the road junction is shown in Fig. 7 (Insert). The students wanted to investigate the following hypotheses: Hypothesis 1: Traffic flow changes during the day. Hypothesis 2: Traffic congestion occurs at all sites going towards and away from the road junction. The students chose eight sites to do traffic surveys. These are shown on Fig. 7. They agreed to do four separate counts lasting one hour at the following times: 08.00 to 09.00 11.00 to 12.00 14.00 to 15.00 17.00 to 18.00
📋 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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