Which early pioneer in sport psychology took a more scientific, data-based approach to psychology, seeing sport as an excellent way to demonstrate the value of this "new scientific psychology" and to investigate character development in sport?

E.W. Scripture

Explanation:

E.W. Scripture is the early pioneer in sport psychology that took a more scientific, data based approach to psychology, seeing sport as an excellent way to demonstrate the value of this "new scientific psychology" and to investigate character development in sport.

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