Calculate quartiles using an explicitly stated convention.
Skills resources are shared. Check your qualification page for its specific assessment conditions.
Interquartile range
Use medians of the lower and upper halves: Q1 is the median of the first four sorted values and Q3 the median of the last four. This convention is stated because quartile methods differ.
Observation
Pebble length (mm)
1
9
2
11
3
12
4
14
5
17
6
18
7
21
8
25
Fictional pebble measurements All values are synthetic.
Resource description
Fictional pebble measurements
Use the resource carefully
State the unit and the part of the resource you used. A pattern in a fictional dataset is evidence for that exercise; it does not establish a fact about a real place.
Check whether an explanation is supported by the data or needs additional geographical knowledge. For statistical tasks, a calculated result does not establish causation or significance by itself.