Plants of the same species grow on opposite sides of a river. It is thought that plants on the north side grow taller than those on the south side. Eight randomly selected plants are chosen from each side of the river, removed and their lengths measured to the nearest cm. By using a Wilcoxon rank-sum test, investigate this claim with a. 5% significance level.

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North side 23 21 20 28 27 19 24 25 South side 18 15 22 14 16 22 17 26