Question: How does the ratio 'difference between groups' over 'difference within groups' helps us determine if two means are statistically (significantly) different? How do you use

How does the ratio 'difference between groups' over 'difference within groups' helps us determine if two means are statistically (significantly) different? How do you use the term "error variance" in this explanation?

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how does the ratio 'difference between groups' over 'difference within groups' helps us determine if two means are statistically (significantly) different using the term error varience?

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