What was the purpose of splitting the babies into two groups in skeels and dye’s experiment?

The purpose of splitting the babies into two groups in Dye and Skeels’ experiments is that the one-half of the groups will receive a special treatment. Skeels and Dye's experiment is an experiment wherein the children in a certain experimental group will be removed from the non-stimulating orphanage and then they will be placed in the one-to-one care of teenage girls who have mental problem and at the same time who lived at the institution.