Question

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?

Answer 1

The null hypothesis for the study is that the body lotion had no effect on the body parts to which they were applied. This is because a null hypothesis states that there is no statistically significant relationship between the two variables considered. The null hypothesis is generally what the experimenter wants to disprove as he/she wants to know how one variable affects another.