This document discusses various data collection methods used in business research including censuses, surveys, observation, questionnaires, interviews, and case studies. It then focuses on experimental methods, defining independent, dependent, and controlled variables. An experiment aims to test one variable at a time in a fair, unbiased manner by manipulating the independent variable and measuring its effect on the dependent variable while controlling other outside factors. Examples are given of experiments involving puzzle completion times, water temperature at different depths, and taste preferences with varying sugar levels.