Suppose the correlation between the average height of parents and
Suppose the correlation between the average height of parents and the height of their firstborn male child is 0.5. You are also told that:
• The average height of all parents is 66 inches.
• The standard deviation of the average height of parents is 4 inches.
• The average height of all male children is 70 inches.
• The standard deviation of the height of all male children is 4 inches.
If a mother and father are 73 and 80 inches tall, respectively, how tall do you predict their son to be? Explain why this is called “regression toward the mean.”

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