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200 people with medium length hair.

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According to the results, detangler spray helps brush hair.

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The approximate cost of this experiment was $12500.

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Does spraying detangler help you brush your hair?

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Randomization

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100 people get detangler spray, the other 100 get water.

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Tangle-free hair.

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Water spray

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89% of people said detangle spray worked. 17% of people said water worked. All subjects had the chance to try both products. The 17% had straight hair, which did not need much detangling in the first place. Therefore, the water worked fine for them. Meanwhile, the detangle spray helped aid brushing for all hair types, especially curly and natural hair.

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Detangler spray, Water spray

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Get another 200 people and test them with detangler spray and water spray.

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200/7.07

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The first 100 people will take the detangler spray first while the last 100 people take the placebo first.

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Matched by hair type, hair color and age.

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Hair type. (curly, straight, natural)

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Participants will get an unlabeled bottle of product, which lab assistants also don’t know what type of bottle they give.