A company wants to compare two types of fertilizer (Brand A and Brand B) to see which one helps the plants grow faster. Twenty identical plants are used to test the fertilizer. A botanist spreads Brand A fertilizer on the north side of a plot and Brand B fertilizer on the south side, and then plants the 20 plants randomly throughout the plot. The company comes and measures the plants on the plot. Brand A has heights of 12 and Brand B has heights of 6. It is then determined that Brand A helps the plants grow faster.

This scenario describes what type of experiment?

single-blind (blinded subjects)

single-blind (blinded researcher)

double-blind

no blinding