African droughts and dust Is there a relationship between the amount of dust carried over large areas of the Atlantic and the Caribbean and the amount of rainfall in African regions? In an article (by J. M. Prospero and P. J. Lamb, Science, vol. 302, 2003, pp. 1024–1027) the following scatterplots were given along with corresponding regression equations and correlations. The precipitation index is a measure of rainfall.

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Dust (g m (a) (b) (c) 35 35 35 30 30 30 25 25 25 20 20 15 15 20- 15 10 10 5 0 5- 0 10 5 0 -1.6-1.2-0.8-0.4 0.0 0.4 0.8 -1.6-1.2-0.8-0.4 0.0 0.4 0.8 -1.6-1.2-0.8-0.4 0.0 0.4 0.8 Precipitation Index