Before research can proceed, the hypothesis must be made more ________ through the use of operational definitions

If a researcher watches one-week-old babies and records how many times they open and close their eyes while lying in their cribs, he is most likely using:

the case-study method. a controlled experiment. cross-sectional research. scientific observation.

Maltreatment and abuse can be cut in half when families participate for two or more years in intervention programs that include preschool education and family support

Indicate whether the statement is true or false