A researcher conducts an experiment using 10 loads of white shirts with similar stains. The loads are divided, and 5 of the loads are washed with name-brand detergent, while the other 5 are washed with store-brand detergent. Volunteers are asked to assess the cleanliness of the shirts. What are the experimental units in this setting?
A
the volunteers who assess the stainsD
the machines used to wash the shirtsExperimental units are the individuals or groups that receive the treatments. Here, each load of shirts is washed with one of the two detergents, so the 10 loads are the experimental units. The volunteers assess the results but do not receive a treatment.
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