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Twenty college students experience the effects of alcohol on reaction time. They perform very basic timed...

Twenty college students experience the effects of alcohol on reaction time. They perform very basic timed responses in a driving simulator both before and after consuming several alcoholic beverages. The researcher collects a reaction time result for each of the 20 students before and after intoxication, for a total of 40 measures. What are the degrees of freedom for this study?

  

a) 40

  

b) 19

  

c) 20

  

d) 39

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