It’s still early We expect that a baseball player who has a high batting average in the first month of the season will also have a high batting average the rest of the season. Using 66 Major League Baseball players from the 2010 season,23 a least-squares regression line was calculated to predict rest-of-season batting average y from first-month batting average x. Note: A player’s batting average is the proportion of times at bat that he gets a hit. A batting average over 0.300 is considered very good in Major League Baseball.
(a) State the equation of the least-squares regression line if each player had the same batting average the rest of the season as he did in the first month of the season.
(b) The actual equation of the least-squares regression line is y^ = 0.245 + 0.109x. Predict the rest-of-season batting average for a player who had a 0.200 batting average the first month of the season and for a player who had a 0.400 batting average the first month of the season.
(c) Explain how your answers to part (b) illustrate regression to the mean.
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