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Chapter13 - the factor • An example is that we might...

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Chapter 13 Experiments and Observational Studies
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Experiment An experiment manipulates factor levels to create treatments, randomly assigns subjects to these treatment levels, and then compares the responses of the subject groups across treatment levels.
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Random Assignment A random assignment is an experiment that must assign experimental units to treatment groups at random.
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Factor A factor is a variable whose levels are controlled by the experimenter. An experimenter must identify at least one explanatory variable, known as a factor, to manipulate and at least one response variable to measure.
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Definitions from Earlier Humans who are experimented on are commonly called subjects. Other individuals are known as experimental units.
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Levels The specific values that the experimenter chooses for a factor are called the levels of
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Unformatted text preview: the factor. • An example is that we might assign our participants to sleep 8 hours a day. Treatment • The combination of specific levels from all the factors that an experimental unit receives is known as its treatment. 4 Principles of Experimental Design 1. Control 2. Randomize 3. Replicate 4. Block Control Group • The experimental units assigned to a baseline treatment level or a null treatment. Their responses provide a basis for comparison. Blinding • Any individual associated with an experiment who is not aware of how subjects have been allocated to treatment groups is said to be blind. Placebo • A treatment known to have no effect, administered so that all groups experience the same conditions. Experimental Design • Show on board...
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