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A team of 10 researches worked together to plan and execute the experiment that were paid a flat rate of $500 per trial. Two teachers were paid at a rate of $20 an hour to conduct the tests and oversee the students. Each cup of caffeinated coffee cost about $1.50 each and the coffee containing no caffeine cost $1 even per cup. The students volunteered to be in the study, allowing there to be no cost of using the subjects. However, at the conclusion of the testing each student received a $5 gift card to Starbucks.
Researchers: 10 researchers x $500 x 2 trials = $10,000
Teachers: $20 x 2 hours x 2 trials = $80
Caffeinated Coffee: $1.50 x 50 students = $75
Decaffeinated Coffee: $1 x 50 students = $50
Gift Cards: $5 x 50 students x 2 trials= $500
Total cost: $10,705

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Does consuming caffeine before a test affect the scores earned?

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50 High school students.

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A random number generator is used to determine which students are receiving caffeine and which are receiving the decaffeinated beverage.

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A cup of coffee that contains caffeine and a cup of coffee that does not contain caffeine.

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Whether or not caffeine is consumed.

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Score earned on given test.

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The students will all receive a cup of coffee. The students will not know whether their cup contains caffeine or not

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100 students are selected randomly and a random number generator is used to determine which students will receive the caffeinated drink and which will not.
The lurking variable is whether or not the student is educated on the material tested and test score history.

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The results showed that caffeine does in fact help in scoring better on tests. While the majority of those who consumed the placebo scored more poorly than those who consumed caffeine it is unrealistic to say caffeine is needed to score high on tests as there were a few very high scores earned by those who did not consume caffeine.

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The students that consumed the caffeine scored an average of 87.2% on the test given compared to those that did not consume caffeine that scored an average of 80.1% on the given test.

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The same experiment will be given to another 50 students of a different high school.

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The margin of error is 31.06% which is a somewhat high percentage. This percentage is so high due to the sample size being a very small percentage of the overall population. This doesn't decrease the confidence in the results however as it would be near impossible to test the entire population as it would take many years and an unattainable amount of money.

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The results pointed towards the consumption of caffeine leading to better test scores. The average scores of those who consumed caffeine trumped that of those who did not by 7.1% which is a significant difference as it is almost a whole letter grade. This shows that consuming caffeine prior to a test will positively impact performance.

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50 high school students.

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The cup of coffee that is decaffeinated (contains no caffeine).

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The students will be randomly selected using a random number generator.