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Developmental psychologists at a prominent California university conducted a longitudinal study investigating the effect of high levels of curiosity in early childhood on intelligence. The local population o f 3 -year-olds w as screened via a test battery assessing curiosity. Twelve o f t he 3 –year olds scoring in the upper 90% of this variable were given an IQ test at age 3 and again a tag e 11. The following IQ scores were obtained.

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a. Using  0.0 12 t ail, w hat do y ou conc lude? I n drawing y our c onclusion, a ssume t hat i t is w ell established that IQ stays relatively constant over these years for individuals with average or belowaverage levels of curiosity.

b. What is t he size o f t he effect? cognitive, developmental

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