Suppose that we wanted to compare three interventions for preterm infants, with regard to effects on the infant's heart rates: (1) nonnutritive sucking, (2) nonnutritive sucking plus rocking, or (3) rocking alone. The 12 infants participating in the study are randomly assigned to six different orderings of the three treatments. Heart rate measurements are taken on all 12 infants following each condition.
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