Ability to grow in shade may help pine trees found in the dry forests of Arizona resist drought. To test this hypothesis, investigators planted pine seedlings in a greenhouse to a randomly assigned light intensity: full light, light reduced to 25% of normal, or light reduced to 5% of normal. At the end of the study, they dried the young trees and weighed them.
Which type of study is this?

Question

Quizplus · Accepted Answer

This is a completely randomized experiment because the light intensity is randomly assigned to the pine seedlings.

Ability to Grow in Shade May Help Pine Trees Found