Factorial ANOVA example ahead! With a lovely interaction. And I have a year old and a 4.5 year old and they are sickly day care kids, so this example really spoke to me.
NPR did a story about a recent publication that studied how we administer medicine to our kids and provides evidence for a few things I've suspected: Measuring cups for kid medicine are a disaster AND syringes allow for more accurate dosing, especially if the dose is small.
The researchers wanted to know if parents properly dosed liquid medicine for their kids.
The researchers used a 3 (dosage, 2.5, 5.0, 7.5 ml) x 3 (modality: small syringe, big syringe, medicine cup) design. They didn't use factorial ANOVA in their analysis, this example can still be used to conceptually explain factorial ANOVA.
How to use in class:
-An easy to follow conceptual example of factorial ANOVA (again, they didn't use that analysis in the original paper, but the table above illustrates factorial ANOVA beautifully).
-An easy to follow example of what an interaction can look like.
-An example that is medical in nature
-An example that might reach your non-traditional and student parents
-Interesting methodology: They used for reals parents using for reals medical implements.
-How should doctors use this data? How about pharmacists and parents? What sort of implement is associated with the least overall error?