Laundry detergents
A consumer group wants to test the efficacy of a new laundry detergent. They take 16 pieces of white cloth and stain each with the same amount of grease. They decide to try it using both hot and cold wa- ter settings and at both short and long washing times. Half of the 16 pieces will get the new detergent, and half will get a standard detergent. They'll compare the shirts by using an optical scanner to measure whiteness.
a) What are the factors they are testing?
b) Identify all the factor levels.
c) What is/are the response(s)?