Question: Do nice guys really finish last In baseball there is

Do nice guys really finish last? In baseball, there is an old saying that "nice guys finish last." Is this true in the competitive corporate world? Researchers at Harvard University attempted to answer this question and reported their results in Nature (March 20, 2008). In the study, Boston-area college students repeatedly played a version of the game "prisoner's dilemma," where competitors choose cooperation, defection, or costly punishment.
At the conclusion of the games, the researchers recorded the average payoff and the number of times punishment was used for each player. A graph of the data is shown in the accompanying scatterplot.
a. Consider punishment use (x) as a predictor of average payoff (y). Based on the scatterplot, is there evidence of a linear trend?
b. Refer to part a. Is the slope of the line relating punishment use (x) to average payoff (y) positive or negative?
c. The researchers concluded that "winners don't punish"? Do you agree? Explain.

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