Mat 152 A textile factory would like to know whether a new synthetic-fabric sock is as durable as their current cotton socks. The plant is using 120 subjects in a study to test their socks. The researcher asks each participant to wear a cotton sock on one foot and a synthetic-fabric sock on the other foot. The coordinator uses a random number generator to assign half of the participants to wear the synthetic-fabric sock on the right foot, and the other participants to wear it on the left foot. matched pairs, completely randomized, or randomized block