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Statistical significance
We randomized the 30 participants in the study, and will do so again when replicated.

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Results
At the end of the one month period of the experiment, we were able to calculate based off of reports whether anxiety levels increased, decreased, or stayed the same for those who drank energy drinks.

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Replication
We will replicate this experiment with 30 new random subjects. This will be able to give us more results and better data.

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Matched pair design
We matched people up based upon their natural anxiety levels, and this allowed us to gauge anxiety levels based on the energy drinks.

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Sample size/ MOE
With a sample size of 30, our margin of error was 18.2%. This is an ok margin of error, but is not the best.

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Control group
Our control group is the fifteen students who will not be drinking the energy drink. There is no placebo.

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Randomized/lurking variables
We handed out flyers to random high school kids. They then volunteered for the experiment based off of their wanting to do it.

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Selection method
Our thirty students were randomly volunteered after being handed a flyer for the experiment.

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Response variable
At the end of four weeks we had each person report their anxiety levels over the course of the month.

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Explanatory variable
Our explanatory variable was which treatment each group received, energy drink or no energy drink.

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Treatments
15 subjects had a energy drink every other day for a month. The other 15 subjects had no energy drinks for a month.

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Experimental units
We randomly found 30 students who both had anxiety and did not.

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Question
How do energy drinks affect anxiety levels?