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Should the n for sample size be capitalized? Is there a difference between n and N?
There is actually a difference in some textbooks: $N$ generally means population size and $n$ sample size.
However, this is not always the case. You should check in your textbook.
In terms of ANOVA small n (usually subscripted) could mean the sample size of a particular group while capital N might mean the total sample size. It depends on context.
small letter n refers to the sample size whilst the capital letter N refers to the the population size of the test