Dr. Flowers believes that plants grow better when they are fed red water. To give scientific credibility to his ideas, he conducts an experiment in which 30 randomly selected plants are assigned to three experimental groups (10 plants per group). He waters the plants using three identical solutions except that one of the solutions contains blue ink, one contains green ink, and one contains red ink. After three weeks of treatment, he measures how much the plants grew. What statistical test should he use?

a) z test d) t test for dependent (correlated) samples

b) t test for single sample e) F test (ANOVA)

c) t test for independent (unmatched) samples f) chi-square test