This section is a summary of the topics you will have covered in GCSE Mathematics.
Types of Data
- Qualitative data (non-numerical, more descriptive e.g. colours)
- Quantitative data (numerical) there are two types for this:
– discrete; limited to particular values e.g. number of walnuts
– continuous; any value within a range e.g. weights of walnuts
Steam and Leaf Diagrams
A stem and leaf diagram is used to order and present data that is given to 2 or 3 significant figures. It is for lazy people, and also enables the shape of distribution to be revealed for analysis. 2 sets of data can be compared back-to-back using stem and leaf.
Also, individual values of data are preserved.
13|7 12|5 means 125 lb
12|7 11|4 means 114 cm