This document discusses various quantitative research methods. It defines quantitative research as a formal, objective process using numerical data to obtain information. Quantitative methods described include surveys to gather data on health needs, attitudes, or phenomena. Correlational studies examine relationships between variables but not cause and effect. Experimental research determines cause and effect by examining the effect of an independent variable on a dependent variable. Comparative studies examine differences between groups on dependent variables. Evaluation research assesses the effectiveness of interventions like workshops. Instrument development research creates and tests tools to measure concepts like quality of life.