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The p-value is 0.002, suggesting that at least one of the means is different.  I then did a post-hoc analysis of means to see which group was different.  What I found was strong evidence of a difference between the caffeine group and both the water and decaf groups

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In this experiment I showed that regular coffee really does make people feel more awake!

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My results probably aren't that much of a surprise.  Coffee works!   Maybe it is a little surprising that there was such a difference between decaf and regular coffee.  I would have expected the placebo effect to be more pronounced.

One challenge is that these results are based on how subjects felt. A better experiment might find an objective measure of chemistry or response time?

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For my project I was interested in learning about whether drinking coffee or water makes people more alert.

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20 faculty chose to participate in my experiment (but I didn't tell them exactly what it was about) and half were randomly chosen to get regular coffee and the other half drank decaf.  This was a double blind study.

At the end of the week, each participant self reported their energy level. Data was analyzed using a two-sample t-test to evaluate the null hypothesis that there is no difference between the groups.

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Here is a boxplot of the two different groups. Oh look, actually there are three groups because I decided to add a control group (no coffee!) as well.

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People have been drinking coffee for years and years. Why? It tastes great, but does it keep you awake? Amazingly, no one has ever studied this before.

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The following is a summary table of my results for the three groups.

(add a table here?)

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Since I decided to look at three groups, I used ANOVA to evaluate the null hypothesis of no difference between the means.  Here is my ANOVA output.