Statistics

3. A graph using vertical bars to display the frequency of categories.
8. A data set where values are not evenly distributed; more values cluster on one side.
10. A circular graph divided into sectors, where each sector represents a proportion of the whole data set.
11. Data that consists of numbers. Example — heights, test scores.
15. A data value that is much higher or lower than the rest of the data set.
19. A rectangle divided into sections proportional to the frequency of each category.
21. A display that organises numerical data by splitting each value into a stem (leading digits) and a leaf (last digit), showing the shape of the data.
22. A graph where data points are plotted and connected by lines, used to show change over time.
23. A method of collecting data by asking people questions.

1. A data set where values are evenly spread around the centre.
2. Numerical data that can take any value within a range, usually from measuring. Example — height, temperature.
4. The average of a data set, calculated by adding all values and dividing by the number of values.
5. The value that appears most often in a data set. There can be more than one mode.
6. The middle value when data is arranged in order from smallest to largest. If there are two middle values, take their average.
7. A graph where each data value is represented by a dot above a number line. Good for small data sets.
9. A table showing each data value or category alongside how many times it occurs.
12. The difference between the largest and smallest values in a data set. Calculated as maximum minus minimum.
13. Data that is grouped into categories or labels, not numbers. Example — favourite colour, type of pet.
14. A counting method using marks grouped in fives to record how often something occurs.
16. Numerical data that can only take specific separate values, usually from counting. Example — number of students.
17. Data collected directly by the person conducting the investigation (e.g. via survey or experiment).
18. Data collected by someone else and used by another researcher.
20. Information that is collected and recorded for analysis. Can be numerical or categorical.