Researchers conducted a controlled study to evaluate the relationship between different soil types and the growth rates of a particular flowering plant species, Rudbeckia hirta. The study utilized three soil types: sandy soil, loamy soil, and clay soil. Each soil type was tested in three replicates, with identical conditions of sunlight and watering. After a growth period of eight weeks, the researchers recorded the height of the plants as a measure of growth rate.
Below are the average height measurements (in centimeters) at the end of the study:
Based on the results, what conclusion can be drawn regarding the impact of soil type on the growth rate of Rudbeckia hirta?