regression, Basic Statistics

Tuddenham and Snyder obtained the following results for 66 California boysat ages 6 and 18 (the scatter diagram is football-shaped):
average height at 6 ˜ 3 feet 10 inches, SD˜1.7 inches,
average height at 18˜5 feet 10 inches, SD˜2.5 inches, r˜ 0.80
) Find the r.m.s. error for the regression prediction of height at 18 fromheight at 6.

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