Graph, chart & data interpretation：練習問題

Original chapter practice: 40 marks. Suggested time: 60 minutes (Thinka practice estimate, not an official exam duration). Answer all 10 questions. All sites and numerical datasets are synthetic teaching examples. This is not a full official HKDSE paper. Use a calculator, ruler and pencil; show units and working.

Which display best investigates the relationship between paired tree-cover percentages and temperatures at 12 sites?

A synthetic passenger count rises from 80 to 100. What is the percentage increase?

Walking’s share rises from 30% to 45%. The change in percentage points is:

In a histogram with unequal class widths, bar height should normally represent:

Four sites show lower temperatures where tree cover is greater. Which conclusion is best supported?

Synthetic counts are 2, 4, 4, 6 and 9. (a) Calculate mean, median, mode and range. [4] (b) A confirmed recording error changes 9 to 90. Which of mean or median changes more, and why? [1]

Synthetic travel survey: district A has 10 walkers among 20 respondents; district B has 20 walkers among 80 respondents. (a) Calculate each walking percentage and the combined percentage. [3] (b) Explain why averaging the two percentages is inappropriate here. [2]

Synthetic pedestrian counts per minute at A are 8, 10, 12 and at B are 2, 10, 18. Statistical output for these complete sets gives standard deviations of 1.63 pedestrians/min at A and 6.53 pedestrians/min at B. (a) Find both means. [1] (b) Compare the variability using the supplied standard deviations and explain what standard deviation measures. [3] (c) State one implication for interpreting the means. [1]

Figure G shows synthetic tree cover and air temperature at four sites measured once. Values are (10%,34°C), (30%,33°C), (50%,31°C), (70%,30°C). (a) Describe the relationship using two pairs of values. [3] (b) Explain one geographical process consistent with it. [2] (c) Explain why it does not prove causation. [2] (d) Propose an improved comparison design with three specific features. [3]

Synthetic bus journeys in months 1–5 are 80, 120, 100, 140, 160. (a) Choose a suitable graph and specify both axes and units. [2] (b) Describe the overall change and one exception, with figures. [3] (c) Calculate the percentage change from month 1 to month 5. [2] (d) A report claims the rise proves a new bus lane caused a permanent 100% increase in all districts. Evaluate that claim and state one additional evidence source needed. [3]