Two students, Mark and Priya, discussing their project on how

Section 3. You will hear two students, Mark and Priya, discussing their project on how students travel to campus with their tutor. First, you have some time to look at questions 21 to 24. Now listen carefully and answer questions 21 to 24. TUTOR: Mark, Priya, I've read your draft on student commuting. Let's talk it through. You surveyed a lot of students, how did you decide who to include? PRIYA: That was our first real headache. We were worried that if we just asked our own friends we'd get a totally biased picture, and an online link posted in a couple of group chats would have had the same problem, only the keenest ever reply. So in the end we physically stood at three different campus entrances, at different times of day, and asked whoever happened to walk past. TUTOR: Sensible, that's a far fairer sample. Did you pilot the questionnaire first? MARK: We did, on about twenty people, and thank goodness we did. Our very first version asked, 'how far do you live from campus?', but people answered in completely different units, some in miles, some in minutes, some in kilometres, so we couldn't compare a single one. We scrapped that and rewrote it to ask for their postcode instead, which we could map precisely. TUTOR: A good fix. Now, your headline result, that most students walk. What do you make of it? Before you hear the rest of the discussion, you have some time to look at questions 25 to 30. PRIYA: We were taken aback at first. We'd fully expected most to drive, given how everyone complains about parking. But when we looked closer it made complete sense, this university has very little parking and a great deal of student housing packed in nearby. A fair number take the bus, hardly anyone cycles, but walking wins easily. Mind you, it might well not hold for a campus out in the countryside. TUTOR: Exactly, an important limit on the conclusion. Any other weaknesses you'd point to? MARK: Yes, an honest one. We ran the survey in a single week in May, so we've almost certainly underestimated cycling, far more people cycle in summer than in the wet, dark winter months, and our one-week snapshot completely misses that seasonal swing. TUTOR: Good, that's very honest. If you ran it again, what would you change? PRIYA: Two things. We'd spread the survey right across the whole year, rather than one week, to catch those seasonal changes. And we'd add a question on why people choose the method they do, which, frustratingly, we left out entirely. MARK: That's the real gap, we can describe exactly what students do, but we can't really explain why they do it. TUTOR: That's a strong basis for your evaluation section. Well done. That is the end of Section 3. You now have some time to check your answers.