According to Thomas and Chess,who carried out a large-scale study of infants in the New York Longitudinal Study,what percentage of children were found to be "easy babies"?

Question

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Thomas and Chess found that 40% of the children in their New York Longitudinal Study were classified as "easy babies," meaning they had a positive mood, regular body functions, and adapted easily to new situations.

According to Thomas and Chess,who Carried Out a Large-Scale Study