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Does eating breakfast make you do better in school?

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We had 40 Boulder Creek students split into 2 groups. Their homework and test scores were compared after the experiment. The experimental units were the 40 students.

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Our response variable was the students’ performance in school (test & homework scores).

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The 40 students were chosen randomly, but we had to get permission from their parents to be allowed to do this. We had 13 seniors, 15 juniors, 5 sophomores and 7 freshman.

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We gave 20 students breakfast before school for 4 weeks and the other 20 students did not have breakfast for those 4 weeks. After the 4 weeks was up, we compared the homework and test scores of the students that had breakfast to those that were not given breakfast.

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Our explanatory variable was whether or not the students ate breakfast or not.

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We are running this study with 40 students so our margin of error is 15.82%. This is a pretty decent sized margin of error, but sampling with more students would be more difficult and time consuming.

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This study could be replicated in the future with more students. We may consider comparing test results before and after eating breakfast as well. Replication would add confidence to our results. With only 40 students being tested, replication is probably needed.

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Our subjects were not blind in this study. They knew which treatment they were receiving. The experiment is also not double blind because we knew what treatments we were giving them.

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We believe the results are statistically signifcant because the students that ate breakfast did 11% better on tests and 13% better on homework than the students that did not eat breakfast. Replication is needed to add confidence to our results and to make sure this wasn't just a one time thing.

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The students that ate breakfast before school had an average test score of 91% and an average homework score of 95%. The students that did not eat breakfast before school had an average test score of 80% and an average homework score of 82%.

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We randomized the students and have students that are pretty spread out among grade levels. We still have lurking variables like the students’ school performance prior to the experiment and whether or not the students already had breakfast or not before the experiment.

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Our study was replicated by our team with more students. We also compared test scores before and after the experiment for the group that ate breakfast. In the new study the students that ate breakfast had an average test score of 93% and an average homework score of 94%. Their test scores also increased by an average of 12% from before the experiment. The students that did not eat breakfast had an average test score of 79% and an average homework score of 81%. This confirms the results of our previous study. Students that eat breakfast before school perform better academically than those who do not eat breakfast before school.

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We did not have a control group which could have affected the results of the experiment.

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We are using RBD to ensure that the selection process is random and that the treatments are chosen at random.

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We had a team of 10 reaserchers that were paid hourly ($11 an hour) for 5 days a week for 4 weeks. They worked a total of 60 hours. We also spent $200 on the food.

Salaries: 10 x 11 x 60 = $6,600
Food: $200
Total Cost: $6,800