Sphericity

How many data points would each participant provide for an experiment which is analysed using a Repeated Measures 2×2 ANOVA? 

A researcher was interested in the interaction between experience and mild intoxication on driving performance.  They recruited 40 drivers to complete a driving simulation task.  Half of the participants were highly experienced drivers, while the others were relatively inexperienced. Participants all completed the task under two conditions: once when they were sober; and again after […]

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