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200 high school seniors one month away from taking the SAT.

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We went to the same high school and asked 100 senior girls and 100 senior boys if they wanted help in studying for the SAT for one month will all materials provided and a free chance to take the SAT.

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Chewing gum while studying and taking the SAT or not chewing gum while studying or taking the SAT

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Does chewing gum while taking a test improve your test score on the SAT

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For randomized block design we took all 200 seniors and blocked them in by GPA ranging from 4.0-3.0 and 2.9-2.0. Then randomly assigned which group got to chew gum for studying and taking the test and which group did not get the gum. then at the end of the month of studying and taking the test

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100 seniors chew gum while studying for the SAT and while taking the SAT
100 seniors do not chew gum either studying or taking the SAT

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We are not able to do a blind or a double blind experiment because they subject we are testing on will have to know that they are either chewing the gum during studying and taking the test or they are to chewing the gum studying or take the test. This can not work for double blind because the sample size is small and everyone knows who is chewing the gum and who is not.

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Our control group was the 100 seniors that did not get to chew gum during the month or during the test. We do not have a placebo because it is impossible to have one in this experiment.

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Which group of 100 senior scored the average higher test scores on the SAT, chewing gum or not chewing gum?

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If we had 200 seniors from one high school be random selected from a random number generator, the potential lurking variables would be the type of flavor of gum (if they like it or not), GPA, classes taken previously, IQ, and preparation for the test before this study started like taking the PSAT.

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Chewing gum while you study and while you take the SAT will improve your test score. In both groups, separated by Gpa, the kids who chewed gum had a higher score. This product is already on the market, but it is more encouraged to use among test takers.

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Study pays for the participants test: 200x$60=$12000
Cost of gum for 100 participants for a month: $200
Study materials for all participants: $4000

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We chose 200 random seniors to complete this study. The results were statistically significant because there was a large gap between the test scores with chewing gum , and the scores without it.

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We could replicate this study with a larger amount of subjects to verify that the results are valid and significant. We will test seniors from a different location.

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With a sample size of 200, the margin of error is set at  7.1% This is a fairly good representation of our population.