In Exercise 2.136 on page 100, we looked at the relationship between total hits by team in the 2010 season and division (NL or AL) in baseball. Two other variables in the BaseballHits dataset are the number of wins and the number of runs scored during the season. The dataset consists of values for each variable from all 30 MLB teams. From these data we calculate the regression line:

(a) Which is the explanatory and which is the response variable in this regression line?
(b) Interpret the intercept and slope in context.
(c) The Oakland A€™s won 81 games while scoring 663 runs. Predict the number of games won by Oakland using the regression line. Calculate the residual. Were the A€™s efficient at winning games with 663 runs?

Exercise 2.136

Major League Baseball is split into two leagues, the National League (NL) and the American League (AL). The main difference between the two leagues is that pitchers take at bats in the National League but not in the American League. Are total team hits different between the two leagues? Figure 2.42 shows side-by-side boxplots for the two leagues. The data are stored in BaseballHits.

Figure 2.42

Transcribed Image Text:

Wins = 0.362 + 0.114(Runs) AL NL Hits 1300 1350 1400 1450 1500 1550