CHAPTER 4: PRODUCING DATA 4.1 Introduction How to verify the following statements? 1. Pet owners are less likely to die of coronary heart disease. 2. Regular large doses of vitamin C reduce the chance of getting a common cold. Response variable– a variable whose changes we wish to study; an outcome or result. Explanatory variable- a variable that explains or causes changes in the response variable. Example:We want to know whether people who exercise regularly are less likely to catch colds. Explanatory variable =status (exercise, no exercise), Response variable = number of colds in a specified period. Study Designs Observational studies Experiments 1
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