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Total variation-explained variation

Using the definitions from problem 6, define the following terms and how they relate to each other:

a. Total variation

b. Explained variation

c. Unexplained variation

d. Coefficient of determination

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You are asked to determine whether or not brunette students have a higher IQ score than other students. To do so, you administer an IQ test to a random sample of 300 brunette students. It is known that the national average IQ score of students is