Read the experimental design and answer the questions: A group of students was trying to determine which type of soil would rose bushes grow the tallest in. They had five rose bushes that they planted in five different types of soil. The five bushes were all the same type and size in the beginning. The size of the pots were the same, they were watered the same amount and kept in the same light and temperature conditions.
a. What was the question and what was their hypothesis?
b. What was the independent variable?
What was the dependent variable? How do you think they measured it?
What conditions (variables) were controlled during the experiment?