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What is the main difference between descriptive and experimental research approaches?

a. the former always uses qualitative data while the latter always uses quantitative data b. descriptive research is done by social scientists while natural scientists do experimental research c. descriptive research involves manipulating variables but experimental research does not d. experimental research is designed to establish cause-and-effect relationships but descriptive research focuses on describing something

________ laborers were the first to be excluded from immigration based on ethnicity

a. African b. Chinese c. Filipino d. Irish e. Japanese