A pediatrician keeps a record of the growth rate of toddlers in height and weight as reported by their parents. Both groups of toddlers are given gummy supplements. One group is given supplements with iron in them, and the other group is given supplements with no iron. Match each description to its corresponding general term. 1. The pediatrician tracks the growth rate of two groups of toddlers, one group that receives iron supplements and the other group that receives supplements without iron. 3 single-blind 2. The group of toddlers that receives iron in their supplement 2 experiment 3. The pediatrician knows which group was given the gummy supplements with iron and which group was given the gummy supplements without iron, but the parents reporting the toddlers' heights and weights do not know which group their toddler is in 1 experimental group