15. Lucy employed an additional measurable and observable variable in her research that she kept constant so that it does not influence the effect of the independent variable on the dependent variable. What variable is she referring to? O Confounding variable O Moderator variable O Control variable O Mediating variable 16. Diyala employed a strategy in her research to help her in studying the culture and social world of a sample she is using. Which strategy did she employ? ID Narrative inquiry Archival research Grounded theory O Ethnography