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(Mock Results of 12 students, MOE of 28.9%)
Coffee drinkers: 84 average
Decaf drinkers (placebo): 75.5 average
Water drinkers (control): 75.25 average

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The costs of this hypothetical experiment would not be that large. Given a cup of coffee costs around $1.00. The largest cost associated would be paying researchers to carry out the treatments and test

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Due to the experiment not being statistically significant, in that it could have happened by pure chance, the outcome of the experiment is thus: Coffee does not help you do better in school

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With a sample size of 42, the margin of error is 15.4

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Since students are randomly placed into treatment groups, lurking variables should be minimized.

Lurking variables being: Prior regularity of coffee consumption, age, sensitivity to caffeine, etc.

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Though this is not a functional experiment with crossover design, it would be if each student were to be given each treatment

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The decaf coffee functions as a placebo, and the water as a control

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Group A will be given coffee

Group B will be given decaf

Group C will be given water

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This experiment is a blind because the two treatment groups don't know if their coffee is decaf or regular.

It would be a double blind if those administering the tests and collecting the results weren't aware either.

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In order to test the effects that Coffee has on one's grades, three high schools from the state of Arizona will be selected and from each 14 volunteers will be gathered.

From the 42 students, each will be randomly assigned into treatment groups of 14.

Group A will receive coffee that morning, Group B will receive decaf, and Group C water.

Every student will than be given a short math quiz, their scores being recorded.

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To test weather coffee consumed in the morning can increase performance in school

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Three high schools from the United States will be randomly selected, and from them 14 volunteers will be selected

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Consumption of coffee in the morning

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The student's performance on a test.

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The Experimental units are: 42 selected high school students in Arizona

The population is: Every high school student in the state of Arizona