Describe a hypothesis that uses 2 independent variables to predict the value of a dependent variable. Explain whether this hypothesis predicts an interaction and/or main effects (and specify which!).
I had created a hypothetical study that involves dandruff shampoo. For the two shampoos (independent variables) I will use two big brand names, one non organic and one organic. For the non organic shampoo I will use Head and Shoulders (IV number 1) and for the organic shampoo I will use the brand name Jason (IV number2). Both male and females will be participate in this experiment, washing their hair once a day for two weeks. I hypothesize that the non organic brand (Head and Shoulders) will clear more dandruff than the organic brand (Jason) at the end of the two weeks.
This experiment can predict a main effect. There could be a difference in the average score between both organic and non organic. I believe this hypotheses does have an interaction. The shampoo may affect men more differently than the women and vice versa.
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