An experiment wants to study the effects of three chemicals on the environment.

Question

An experiment wants to study the effects of three chemicals on the environment. They measure the degree of skin irritation for the three chemicals on rats. The researchers apply each chemical to a one inch square on the rats' back so every rat receives a treatment of each chemical. The researchers also include two species of rat in the study: black and brown. What are the experimental units? What is the response variable? What are the factors and their levels? What are the treatments? Is the study a designed experiment, observational study, or mixed experimental and observational study?

Explanation / Answer

a) The experimental units are: rat

b) the response variable is: the degree of skin irritation

c) factor are : types of chemicals and two species of rat

three types of chemicals and two species of rat: black and brown

d) treatments: three chemicals

e) designed experiment

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