When researchers are interested in studying the relationship between variables that cannot be manipulated they are likely to use which of the following methods?

Your sister is very impressed with her daughter's development, particularly in emotional regulation

Having just completed your reading on brain development, you tell her that the girl's advances in this area of development are likely due to her ______. growth in the frontal lobe superior genetics advanced temporal lobe rapidly developing occipital lobe

People in a hidden population might be more willing to participate in a study if recruited by somebody they know and trust rather than by a researcher. This fact forms the basis of the development of

a. respondent-driven sampling. b. snowball sampling. c. targeted sampling. d. key informant sampling