Aresearcher wants to determine the impact of soil type on the growth of a certain type of plant. she grows three plants in each of four different types of soil and measures the growth in inches for each plant after one month resulting in the data below. soil 1 soil 2 soil 3 soil 412.6 12.2 12.2 11.112.6 12,1 0.6 11.714.3 13,9 1 9.6 what null hypothesis is the researcher testing if she runs an anova with this data? a. the mean growth of the plant in each type of soil is the same. b. one type of soil has a higher mean growth for the plant than the others. c. the variability in growth of the plant in each type of soil is the same. d. oil 3 provides a lower mean growth for the plant than the other types of soil. e. the mean growth of the plant is different in each type of soil.