You know, I was about to go with the Levene's test, but then I realized that's for testing variances, not central tendency. Gotta keep my stats straight! I think I'll stick with the ANOVA test on this one.
Ha! Looks like we've got a tricky one here. I bet the answer is C, the ANOVA test. It's the go-to method for comparing multiple groups, and that's exactly what we've got - three grades to test.
Hmm, I'm not sure about the Levene's test. Isn't that more for testing the equality of variances? I'd go with the Mood's Median test since we're looking at central tendency, not just the means.
I think the ANOVA test is the appropriate choice here to test the central tendency. It allows us to compare the means of the three grades and determine if they are significantly different.
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