Final answer:
Juanita's research to find the best light and sound intensity levels to calm drug-addicted newborns falls under observational research.
Step-by-step explanation:
The research that Juanita is conducting to find which light and sound intensity levels are best used in helping to calm drug-addicted newborns would be considered observational research. Observational research involves taking recordings and measurements of naturally occurring phenomena without directly manipulating the independent variable. In this case, Juanita will be observing the effects of different light and sound intensity levels on drug-addicted newborns.