Revision material for the Edexcel AS Level qualification in Mathematics, topics: statistics.
| Front | What is: an expected value? |
| Back | The weighted average of a distribution (for instance, the oft-quoted 2.5 children per household) |
| Front | Meaning of: sample |
| Back | A subset of members of the population, ideally an unbiased cross-section, from which data are collected and used to estimate the characteristics of the population as a whole |
| Front | What is: extrapolation |
| Back | Using the relationship between variables to estimate an unknown value that lies outside the existing dataset |