Our colleague Dr. Fraudulus believes that red palm oil, due to its high content of vitamin A, will reduce the severity of ADHD symptoms for young children. To investigate whether this is indeed the case, a supplement will be prepared that contains either a placebo, a low dose, or a high dose of red palm oil. Because boys and girls may differ in ADHD symptoms and the response to the red palm oil supplement, we conduct a two-way ANOVA, that takes also gender into account. Suppose we recruit 75 boys and 75 girls to the study. We will then randomly assign 25 of each gender to each of the red palm oil dosage levels.
What is/are the factor(s) for this study (check all that apply)?
Dosage of red palm oil (high dose vs low dose vs placebo)
Gender
Whether Dr. Fraudulus went to a real medical school or not
Level of ADHD symptoms
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