Children who watch many hours of television get lower grades in school, on the average, than those who watch less tv. explain clearly why this fact does not show that watching tv causes poor grades. in particular, suggest some other variables that may be confounded with heavy tv viewing and may contribute to poor grades

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.