Topic 10 · Statistics & Probability
Presenting Data & Interpreting Results
Frequency polygons, back-to-back stem-and-leaf diagrams, scatter graphs and choosing the right chart.
By the end of this topic you can…
- Draw and read a frequency polygon
- Compare two data sets with a back-to-back stem-and-leaf diagram
- Describe correlation and use a line of best fit
- Choose the most appropriate graph for a set of data
Lessons
- Frequency Polygons Plotting frequencies at the midpoints of each class and joining them with straight lines — and using two polygons to compare data sets.
- Back-to-Back Stem-and-Leaf Diagrams Showing two data sets on one shared stem, reading off averages and ranges, and comparing the two.
- Scatter Graphs and Correlation Plotting pairs of data, describing correlation, drawing a line of best fit and using it to estimate.
- Choosing the Right Graph — and Spotting Misleading Ones Matching each kind of data to the graph that suits it, drawing a pie chart, and recognising the tricks that make graphs mislead.
Presenting data quiz
Ten questions drawn at random from a bank of thirteen, covering frequency polygons, stem-and-leaf diagrams, scatter graphs and choosing graphs.
10 questions · pass mark 70%