Plot

123 4 5 678

Biological control

37 42 12 32 97 68 14 29

Chemical control

41 45 18 106 107 171 12 30

Suppose we decide normality is not a good assumption. Perform an appropriate non-parametric test of the null hypothesis that the damage is the same using the biological control or the chemical control, vs the two-sided alternative. Calculate the appropriate observed test statistic by hand, then find a p-value.