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How does pizza affect students' grades?

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We selected one class from each grade level (freshman, sophomore, junior, and senior) - half of the class was given pizza before a quiz, while the other half of the class was given a regular school lunch.

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We will replicate this study with 8 new classes to compare the results. We will go to a new school to eliminate any lurking variables such as location, social class, etc.

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One half of the class will be given pizza before taking a quiz, while the other half will be given a regular school lunch from the cafeteria. Each class will be given a math quiz. The quiz has to be from the same subject to accurately reflect the affects on grades.

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With a population size of 1,600 and sample size of 128, the margin of error is 8.31%

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We selected one class from each grade level to equally represent the whole school. Half of the class received a regular lunch from the cafeteria, while the other class was given pizza for lunch.

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Our explanatory variable was which lunch each half received.

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We will calculate the average quiz grade of each class and compare the averages.

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When splitting the class in half, we tried to make males and females distributed evenly.

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There may be some students in the class who are outliers. Some students may be above average at math while others may be below average. This may skew the averages when comparing them to the other class. Study habits may also affect the results. Students who are more studious may do better than others, no matter which lunch they are given.

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We are not able to blind our subjects, because they will be able to see and taste which lunch they are receiving.

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Our control group will be eating a regular school lunch before the quiz. This is the control since it is what the students will usually eat.