Basic Mathematics: An Introduction: Teach Yourself by Graham Alan

Author:Graham, Alan [Graham, Alan]
Language: eng
Format: epub
Publisher: Hodder & Stoughton
Published: 2017-04-05T16:00:00+00:00

Table 8.1 Air temperature and sales of ice cream over 12 consecutive days

Source : made-up data

In order to draw a scattergraph of this information, you must place one measure on the horizontal axis, place the other on the vertical axis and mark on each axis a suitable scale. As you can see from Figure 8.6 , I have chosen to place ‘Temperature °C’ on the horizontal axis and ‘Sales’ on the vertical axis.

Figure 8.6 Scattergraph showing the relationship between air temperature and ice cream sales over 12 consecutive days.

The data for each day is plotted as a separate point. For example the point corresponding to Day 7 is highlighted on the graph. Following the down arrow to the Temperature axis, you can see that this point lines up with the value 22°C. Reading across to the Sales axis from the same point, the corresponding value is approximately £560 (the actual figure from the table is £559).

The pattern of points on the scatter graph helps to reveal the sort of relationship between the two measures in question. For example, in Figure 8.6 you can see that the points lie in a fairly clear pattern running from bottom left to top right on the graph. This reflects the not-to-surprising fact that ice cream sales tend to be high on warmer days and low on cool days. This is not a rigid relationship but more of a general trend. You will probably need to spend some time consolidating your understanding of a scattergraph, so do Exercise 8.2 now.

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