The table below presents data on rates of growth of vegetation in three different swamps.
Six plants were randomly selected from each site, and their heights(mm) measured.
Swamp1 Swamp2 Swamp3
124 147 141
167 121 144
135 136 139
160 114 162
159 129 155
144 117 150
Use the Kruskal-Wallis Test to find out whether the data provide sufficient evidence to indicate a difference in height of plants in the three swamps. a = 0.05.