3.5 Line graphs

To illustrate how to create and use line graphs, we will use the example of a calibration curve.

A calibration curve is a type of line graph in which the response of a measuring device to a series of known concentrations of a substance is plotted. You can then make a measurement of an unknown sample - in the case we're about to examine, blood serum samples from new-born infants - and use the calibration curve to work out what concentration of substance is present.


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1.1 Introducing the decimal system of numbers

Many different systems for writing numbers have been developed over the history of humankind.

The easiest way of counting small numbers is to use your fingers, and for this reason many numerical systems, such as the decimal system, are based around the number ten. But what happens when you run out of fingers to count on?

Numbering systems get round this problem by using a system of scale in which many small units are represented by a single larger unit, and many of these la
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2.4.1 Try some yourself

Activity 4

Two labels have been omitted in the mathematics below. Where should they go to make sense of the argument?

  • Since

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    The Humpty objection to the Gricean position can be formulated as the charge that Grice is too much like Humpty for his own good. Humpty, we saw, seems to be advocating the following thesis:

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    The natural environment itself is bathed in energy from other sources. Standing on a cliff top on a bright spring day you can feel the warmth of the Sun and the freshness of the breeze and hear the crashing of breaking waves below. All these energetic processes can be compared in terms of Author(s): The Open University

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