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There is no way to blind the volunteers because they know that they volunteered for the study and will be experiencing the sunlight and outdoor time willingly.

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We selected several high schools in the state by numbering them and using a random number generator to pick them. From there we numbered classed and used a random number generator to pick the classes as well as the student in the class, and asked if they would volunteer.

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A lurking variable could be just conditional emotions from outside circumstances or maybe a medication affects the volunteers’ moods.

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Being exposed to an open sunny area

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The happiness gained by the students after being in the sun

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High school students who volunteer

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Since they are volunteers they do not need pay but they do need transportation to the sunny area.

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The data shows that the experiment proved that sunlight can make students happier.

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More volunteers felt happier after sunlight than volunteers that did not.

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The control is the volunteers who do not suffer from depression.

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The hundreds of volunteers from high schools in arizona

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Does sunlight help depression?