15 QUESTION 20 4 points A psychologist wanted to test whether the sound of a human heartbeat would help newbom babies grow. To investigate this theory a baby nursery at a hospital was set up so that the sound of a human heartbeat could be heard throughout the nursery. The hourbead sound was played in the nursery for a large batch of randomly selected newborn babies, who were then weighed to determine their weight gain after four days in the nursery. Later, a second batch of randomly selected babies occupled the nursery, but no heartbeat was played. These children were also weighed after four days in the nursery. What type of study is this? CA. Experiment B. Meta-Analysis C. Observational Study D. Case Control Study