A recent study (J Child Fam Stud, DOI 10.1007/s10826-014-9949-9) found that children in Singapore who had a closer relationship with their parents played fewer hours of video games per week and had fewer pathological symptoms of video-gaming.
a. What is the population of interest for this survey?
b. Describe why this is an observational study.
c. Identify a lurking variable in this study.