Hmm, I'm going to have to go with C) factorial experiment on this one. Though I do wonder if the researchers are feeling a little 'factorial' about their experimental design choices.
Definitely a factorial experiment. I remember learning about those in my statistics class - and how they're super useful for studying the combined effects of multiple factors.
I'm pretty sure this is a factorial experiment. I mean, running all levels of one variable at each level of the other? Sounds like a classic factorial design to me.
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