An investigator measures how much various 4-month-old children cry and kick, and later determines how shy or outgoing those children are when they reach age 7 years. The investigator is probably studying

Question

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The study is measuring how much children cry and kick, which are indicators of temperament. The later determination of shyness or outgoingness suggests a focus on the stability of temperament over time.

An Investigator Measures How Much Various 4-Month-Old Children Cry and Kick