Washing clothes A consumer group wants to test theeffectiveness of a new “organic” laundry detergent and make recommendations to customers about how to bestuse the product. They intentionally get grass stains on 30white T-shirts in order to see how well the detergent willclean them. They want to try the detergent in cold waterand in hot water on both the “regular” and “delicates” wash cycles. Design an appropriate experiment, indicat-ing the number of factors, levels, and treatments. Explain the role of randomization in your experiment.

Question

Washing clothes A consumer group wants to test the
effectiveness of a new “organic” laundry detergent and

make recommendations to customers about how to best
use the product. They intentionally get grass stains on 30
white T-shirts in order to see how well the detergent will
clean them. They want to try the detergent in cold water
and in hot water on both the “regular” and “delicates”
wash cycles. Design an appropriate experiment, indicat-
ing the number of factors, levels, and treatments. Explain
the role of randomization in your experiment.

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