predicted IQ of the twin born second, given that the twin born first has an IQ of 107? What does the r value tell you about the relationship between the IQ scores of twins? What is the Value for r squared? What does the r squared statiscic mean in this scenario?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 31EQ
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Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is r = 0.914 and the equation of the regression line is y = 9.87+0.9x, where x represents the IQ score of the twin born first and y represents the IQ score of the twin born second. What is the best
predicted IQ of the twin born second, given that the twin born first has an IQ of 107?
What does the r value tell you about the relationship between the IQ scores of twins?
What is the Value for r squared? What does the r squared statiscic mean in this scenario?

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