VI. In the following example the researcher was interested in how the application of a fertilizer affected the height of sunflower plants. The fertilizer was applied to one test plot and the height of n = 20 sunflower plants in that test plot were measured.

\f300 250 200 150 100 50 0 O a b ) c) d) e) f) g) h )144.7 149.5 128.2 126.3 154.3 144.7 131.9 138.6 113.6 102.7 101.6 156.9 119.3 141.2 151.2 Zy = 2004.7 Ey? = 272453.21