Which of the following describes a risk associated with cross-sectional research on iq? in a cross-sectional study, the researchers incur significant expenditure of time as he or she waits for the participants to get older. in a cross-sectional study that compares iq scores, the difference in iq scores of 25-year-olds and 45-year-olds is due to differences in educational attainment. in a cross-sectional study, the participants may move or die before the study has been completed. in a cross-sectional study that compares iq scores, the difference in iq scores of 25-year-olds and 45-year-olds is due to the 45-year-olds having taken the same test at several points in time.