Long description

Diagram showing the quartiles for sample size n = 17. The V-shape has two additional arms, one to the left and one to the right, so the shape now resembles a capital letter M, but with the sides sloping. The numbers represented by x subscript 1, x subscript 2 and so on, ending with x subscript 17 are shown.

The shape starts on the left with x subscript 1, followed, slightly higher and to the right by x subscript 2, Following the same line are x subscript 3 and x subscript 4. At that point the V formation begins, but there is a gap at the top. The next entry x subscript 5 is level with but to the right of x subscript 4. The same line is followed by x subscript 6, x subscript 7 and x subscript 8, which is level with x subscript 1. Continuing in the same direction leads to x subscript 9, which is at a lower level than x subscript 1. At x subscript 9 the direction changes again and the letters begin to rise, moving slightly to the right again until x subscript 13 is reached. This is level with x subscript 5. X subscript 14 is to the right of and level with x subscript 13 and forms the start of the last slope. The letters then begin to fall again, moving to the right each time, ending with x subscript 17. This is on the same horizontal level as x subscript 1.

There are three clouds, each containing words. The first contains the words ‘Lower quartile’ and has an arrow pointing to the gap between x subscript 4 and x subscript 5. To the right and at the same level is another cloud, containing the words ‘Upper quartile’, from which an arrow points to the gap between x subscript 13 and x subscript 14. The third cloud contains the word ‘Median’. From it an arrow points to the lowest label, x subscript 9, in the middle of the diagram.