Trees of the same species grow on opposite sides of a river valley. The heights of eight randomly selected trees from each side of the river valley are measured and the results, in metres, are given in the table.

Carry out a Wilcoxon rank-sum test, at the 5% level of significance, to investigate whether there is any difference in the average heights of the trees from the two sides of the river valley. Interpret your conclusion in context.

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East side (m) 13.6 20.1 7.8 18.2 8.5 7.7 16.0 13.4 West side (m) 5.9 7.5 9.6 11.0 4.1 7.1 10.1 12.2