Question: 4.48 Given a random variable X, with standard deviation X , and a random variable Y = a + bX, show that if b <

4.48 Given a random variable X, with standard deviation

σX , and a random variable Y = a + bX, show that if b < 0, the correlation coefficient ρX Y = −1, and if b > 0, ρX Y = 1.

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