Chapter 5

# Chapter 5 - Chapter 5 Experiments, Good and Bad In this...

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Chapter 5 Experiments, Good and Bad In this chapter Variables in a study Treatments in an experiment Things to watch for in an experiment Variables in a study To conduct a study properly, you must do the following: Get a representative sample Get a large enough sample Decide whether the study should be an observational study or an experiment Response variable (dependent variable) – a variable that measures an outcome or result of a study Explanatory variable (independent variable) – a variable that attempts to explain or causes changes in the response variable In algebra class when looking at equations with two variables, you should have identified the y-variable as your dependent variable and the x-variable as your independent variable. This is important when dealing with functions in algebra and is just as important in statistics. When defining x and y you must decide which variable is dependent on the other. Example Suppose you have two variable in a study, dosage of drug and reduction in blood pressure. Which of these is you dependent and which is your independent variable? Answer For a patient, their reduction in blood pressure depends on the dosage of the drug. Therefore, you must define the dependent variable or response variable as

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## Chapter 5 - Chapter 5 Experiments, Good and Bad In this...

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