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Business, 13.07.2019 19:00 proudmarinemom7186

Aresearcher examines the effectiveness of different body lotions by having 12 participants apply four different lotions to the same, unique body locations daily for two weeks. for example, lotion #1 is always applied to the right thigh, while lotion #2 is applied to the upper right arm. the participants were randomly selected at a drugstore in a busy area. what is the null hypothesis for this study?

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