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A developmentalist who is studying the popularity of children's names over the years is actually looking at the cohort effect.
A psychological experiment can be defined as a scientific investigation which typically involves the process of manipulating an independent variable (the cause), so as to determine or measure the dependent variable (the effect) and understand the relationship between the human mind and behaviors.
A cohort effect can be defined as a scientific investigation which occurs when a research result is influenced by the characteristics of the cohorts such as children's names, that are being studied.
In conclusion, a developmentalist who is studying the popularity of children's names over the years is actually looking at the cohort effect.
Read more on cohort effect here: https://brainly.com/question/28269513
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Complete Question:
A developmentalist is studying the popularity of children's names over the years. She is really looking at the _____ effect.
naming
cohort
Hawthorne
generational