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How much does energy drinks effect people while working

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10 coworkers who are between 17 and 25 years old

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Seeing as I was the only person conducting the experiment the only thing that I had to buy was a case of RedBull at $20 after tax and a case of Monster at $18.54. The coffee was free because the coffee at work is provided for workers

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I found out who the people are that are most tired at my work. Then I picked the ones who are about the same age and who don't usually drink energy drinks.

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My explanatory variable is which drink was consumed.

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For 4 different shifts I gave each coworker a new drink and had them complete daily tasks. Each coworker was timed on the daily chores they had to complete. Every new day was a different drink. The drinks consisted of RedBull, Monster, Coffee, and Water. The drinks were not disclosed and instead left a secret.

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Each participant each had a decreased time when drinking the energy drinks and said felt better after the coffee. 2 out of 10 participants had a decrease in time when drinking the water. These two participants exhibited the placebo effect because the other participants had no notable change in time. (Variance in this time is likely due to margin of error.

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This experiment is easily replicated with the same drinks and chores seeing as there is not much variation in variables only the sample size used for the experiment.

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My sample size of 10 has a margin of error of 31.6% which could be improved

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My control group was giving the coworkers water without telling them it was water

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A crossover design could also test different kinds of energy drink. EX. Sugar vs Non-sugar, Organic vs Artificial, ect.

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My response variable will be the time it took to complete the given task.

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A random variable was extra orders/ doing the chore incorrectly that made the time slightly longer. Timer was stopped if the chore was paused.

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The coworkers didn't know which drink they were getting on what day.

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The participants would have a significant decrease in time because of the energy drinks. The water should have little to no effect on the participants.