Do children diagnosed with attention deficit/ hyperactivity disorder (ADHD) have smaller brains than children without this condition? This question was the topic of a research study described in the paper €œDevelopmental Trajectories of Brain Volume Abnormalities in Children and Adolescents with Attention Deficit/Hyperactivity Disorder€ (Journal of the American Medical Association [2002]: 1740€“1747). Brain scans were completed for a representative sample of 152 children with ADHD and a representative sample of 139 children without ADHD. Summary values for total cerebral volume (in milliliters) are given in the following table:

Use a 95% confidence interval to estimate the difference in mean brain volume for children with and without ADHD.

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rt 152 ,059.4 117.5 Children with ADHD Children Without ADHD 139 104.5 113