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Does drinking coffee effect students’ test taking ability?

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300 students from age fourteen to eighteen are selected for this study, 140 male and 160 female.

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We had students sign up for this experiment at a local high school, and then randomly selected these students to be in groups A, B, C, or D which would determine which treatment they would get. They would get a fifty dollar gift card to a coffee place for participating.

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Out of the 300 participants we randomly selected 75 to be put into group A, B, C or D. Group A would be given decaf coffee. Group B would be given half-caffeinated coffee. Group C would be given regular caffeinated coffee. Group D will be given water. We give each group a test to determine whether caffeine affects test taking ability.

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The explanatory variable is whether they receive water, decaf, half caffeinated, or regular coffee.

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How caffeine intake effects test scores

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Gender, age of the students
The students will be randomly selected for each group so there should be a variety of people.

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Group D is given water instead of coffee.

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The subjects do not know what they will be getting, but unfortunately it is kind of obvious what drink they get as soon as they receive it, especially if they recieve water in Group D.

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We would have every group switch treatments until they had all of them to make sure that the results were accurate.

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My sample size is 300 and my margin of error is 5.7%.

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I would repeat the experiment over again to make it less likely that lurking variables are affecting the experiment and to make sure that the results are correct.

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Group A, who had the regular coffee, got the best test score results, and their average score was 96%, which is eight percent higher than those in Group B, who had half caffeinated coffee, and ten percent higher than groups C and D who had decaf and water. The results were the almost exactly the same when repeated. Therefore, caffeine has a positive effect on test taking ability.

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The results are statistically significant because test takers with regular coffee scored ten percent higher than those who had no caffeine and eight percent higher than those who had half caffeinated coffee. Since we took a random sample of people and put them in groups, the results might not be as large as real results.

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Regular Coffee: $225
Half Caf:$215
Decaf:$212
Water: $80
Team Salary: (2 people) $150

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After this study, people realized that coffee would help them on tests in the future. This experiment lost our team money because of of the cost of the supplies.