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With our sample size of 300, our margin of error is 5.5%. This is a small percentage ensuring that our results are representative of the population as a whole.

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We published our findings in a medical journal. Most of our participants have continued to consume coffee as a way to boost short term memory.

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We randomized our 300 participants and the results gave us a difference of 25% in test scores which cannot be achieved by chance therefore making our results statistically significant

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We found that those given the caffeinated coffee prior to the memory test scored an average of 85% on the memory tests, while those in the control group score 60% on average.

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We had a few local Starbucks stores give us a list of 300 people who drink and purchase coffee often. We numbered them all and used a table to select 150 people for each treatment group. Potential lurking variables are age, amount of sleep, diet, and schooling. By randomizing, we can deduct the impact of these.

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We were able to blind our subjects because they were not aware of they were given decaf coffee or  caffeinated coffee. There are many Starbucks around nowadays so it is not very likely that they’d all end up at the same one at the same time. There is also a double blind because we are not aware of who will be getting what type of coffee.

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Our control group is the 150 participants who will NOT have caffeinated coffee in their day. We do have a placebo, and it is the decaf coffee. The participants will not know who receives what.

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At the end of 4 weeks we calculated the scores from the memory test each week they took it to see if there were any improvements or correlations between caffeinated coffee and decaf. We also checked the balance of their gift cards to confirm that they stuck with the program.

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Our explanatory variable was which treatment each unit received. Either they had caffeinated coffee or decaf coffee.

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We found 300 men and women from the ages 18 to 65 who enjoy drinking coffee at least once a day per day. All were given gift cards to Starbucks for a 4 week commitment.

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We will replicate this study in the future using 300 new subjects. We may add multiple new treatments to our study including green tea. This will validate our results confirming their significance.

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150 people from the ages 18 to 65 were randomly assigned to drink caffeinated coffee prior to the memory test. The remaining 150 people were to follow the same instructions but with decaf coffee instead prior to the memory test

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Does coffee consumption improve short term memory?