A Researcher Examines the Effectiveness of Different Body Lotions by Having

question 76

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 null 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.

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Definitions:

Tension

A force that pulls materials apart, causing stress or strain in geological contexts, such as the stretching of the Earth's crust.

Shear

A strain in materials characterized by slippage along parallel planes, often related to faults and shear zones in geology.

Differential Stress

Stress applied to a rock body in different directions, leading to deformation like folding, faulting, or flowing.

Confining Pressure

The pressure applied equally in all directions on a rock or sediment layer, often increasing with depth in the Earth's crust.