Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can explain what the height of a bar and the size of a pie slice each represent. (Guide: “Bar charts” and “Pie charts”)
- I can explain why a frequency bar chart and a relative frequency bar chart of one data set have the same shape. (Guide: “Bar charts”)
- I can say when a pie chart is not appropriate, for example when individuals can give more than one answer. (Guide: “Bar chart or pie chart?”; Practice Q7)
- I can explain how a bar chart differs from a histogram, and why shape words such as “skewed” do not apply to categories. (Guide: “Bar charts”; Practice Q7)
Skills
- I can draw a bar chart with separate, equal-width bars, labelled axes and a scale that starts at 0. (Guide: Worked example 1; Practice Q4)
- I can calculate slice angles from counts or proportions and check that they add to 360°. (Guide: Worked example 1; Practice Q4)
- I can read a count back from a bar chart or a pie chart when I know n. (Practice Q1, Q5)
- I can spot a misleading graph, such as a truncated axis, and say what the data really show. (Guide: “Graphs that mislead”; Practice Q2)
Reasoning
- I can use values read from a graph to support or reject a claim, telling “most common” apart from “a majority”. (Guide: “Using a graph to justify a claim”; Practice Q5)
- I can compare two groups of different sizes using relative frequencies, and explain why counts can mislead. (Guide: Worked example 2; Practice Q3, Q6)
- I can choose a suitable graph to compare groups and justify the choice. (Practice Q6)
- I can write every conclusion in context, naming the individuals, the variable and the values. (All worked examples)
All ticked? Move on to the Topic 1.5 study guide, Graphical Representations for One Quantitative Variable, or return to the course roadmap.