A researcher hypothesizes that freshmen spend more time studying than sophomores, who spend more time studying than juniors, and so on. In conducting a one-way ANOVA with this data, how can the null hypothesis (H0) be stated?
a. H0: all ?s are different
b. H0: not all ?s are different
c. H0: all ?s are equal
d. H0: not all ?s are equal
c. H0: all ?s are equal
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