A particular type of tree can develop a virus that creates black spots on the leaves. The more spots, the more the virus has infected the tree. Two different virus treatments have been developed: treatment X and treatment Y. A sample of eight leaves is chosen. Each leaf is divided into two equal sections without removing it from the tree. On one half, treatment X is used and on the other, treatment Y. The number of black spots on each half is given in the table. 

Test, at the 5% significance level, whether there is a difference between the two treatments.

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B D. F H 41 37 34 12 7 19 23 16 24 21 30 11 14 20 9