changes over time

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    I’m doing an experiment of the effects of coffee.I have groups of coffee drinkers and non-coffee drinkers  and I give them either caffeinated coffee or decaf.  I am interested in caffeine’s effects on salivation and blood pressure. I am recording saliva and BP over @ 45 minutes.  So each person is compared to himself over time and coffee drinkers are compared to non-coffee drinkers also.  Overlooking the fact that I don’t know how to use a time series analysis (I can learn it), does that seem like the right statistic to use?

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