Types of Presentation
Good presentation can make statistical data easy to read, understand and interpret. Therefore it is important to present data clearly.
i. There are two main ways of presenting data: presentation of numbers or values in lists and tables;
ii. Presentation using graphs, i.e. picture. We use the following examples to show the various kinds of presentation.
| An English teacher gave an essay to 15 students. |
She graded the essays from A (very good), through B, C.D, E to f (very poor). The grades of the students were:
B, C, A, B, A, D, F, E, C, C, A, B, B, E, B
Lists and Tables
Rank and order list
Rank order means in order from highest to lowest. The 15 grades are given in rank order below:
A, A, A, B, B, B, B, C, C, C, E, E, F
Notice that all the grades are put in the list even though most of them appear more than once. The ordered list makes it easier to find the following: the highest and lowest grades; the number of students who got each grades; the most common grade; the number of students above and below each grade; and so on.
Frequency table
Frequency means the number of times something happens. For example, three students got grade A.
The frequency of grade A is three. A frequency table, gives the frequency of each grade.
| Grade | A | B | C | D | E | F |
| frequency | 3 | 5 | 3 | 1 | 2 | 1 |
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