Statistical Sciences 1024A/B Lecture 9: Chapter 9 Producing Data- Experiments
20 Apr 2016
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The individual studies in an experiment are called experimental units. When the experimental unit is a person, the individuals are called subjects. The experimental conditions to be applied to the experimental units and then evaluated are called treatments. Actively impose some treatment in order to observe the response. Divide the experimental units into a number of different groups corresponding to the number of treatments. Measure the units to see if there are differences between the treatments. When our goal is to understand cause and effect, experiments are the only source for fully convincing data. Treatments are made up of one or more factors. Factors are the explanatory variables in an experiment. The values taken on by the factors are called levels. Factors/treatments are explanatory variables and the measured response to the treatments is the response variable. If the experiment involves giving two different doses of a drug, we say that we are testing two levels of the factor.
