2. 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 "Developmental 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 152 children with ADHD and 139 children of similar age without ADHD. Summary values for total cerebral volume (in milliliters) are given in the following table: Children with ADHD 152 1059.4 117.5 Children without ADHD 139 1104.5 111.3 Do these data provide evidence that the mean brain volume of children with ADHD is smaller than the mean for children without ADHD? Let's test the relevant hypoth- eses using a .05 level of significance.

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2.
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 "Developmental 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 152 children with ADHD and 139 children of similar age
without ADHD. Summary values for total cerebral volume (in milliliters) are given
in the following table:
Children with ADHD
152
1059.4
117.5
Children without ADHD
139
1104.5
111.3
Do these data provide evidence that the mean brain volume of children with ADHD
is smaller than the mean for children without ADHD? Let's test the relevant hypoth-
eses using a .05 level of significance.
Transcribed Image Text:2. 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 "Developmental 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 152 children with ADHD and 139 children of similar age without ADHD. Summary values for total cerebral volume (in milliliters) are given in the following table: Children with ADHD 152 1059.4 117.5 Children without ADHD 139 1104.5 111.3 Do these data provide evidence that the mean brain volume of children with ADHD is smaller than the mean for children without ADHD? Let's test the relevant hypoth- eses using a .05 level of significance.
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