A person performed a study to test whether exposure to conflict is associated with the age that children started to recognize angry faces. The person used a questionnaire to measure how much conflict infants had been exposed to. They then tested infants monthly from 6-9 months of age to see whether they could discriminate fearful and angry faces. They found that more exposure to conflict was associated with earlier discrimination of fearful and angry faces. This research design is:
a. Correlational; cause and effect can be inferred
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