A Researcher Examines the Effectiveness of Different Body Lotions by Having

Multiple Choice

A researcher 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 research hypothesis for this study?

A) Differences exist between the average effectiveness assessments of each lotion.
B) Lotions cause differences in skin quality across locations.
C) The effectiveness of the four different lotions is the same, on average.
D) The lotions are the same in terms of effectiveness.