Do children diagnosed with attention deficit hyperactivity disorder ADHD have smaller brains than children without this

Question

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 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 Children with ADHD n Children without ADHD 139 USE SALT Ha M1 H X 152 1 058 4 117 9 S 1 104 8 111 1 Is there convincing evidence that the mean brain volume for children with ADHD is smaller than the mean for children without ADHD Test the relevant hypotheses using a 0 05 level of significance Use for children with ADHD and for children without ADHD State the appropriate null and alternative hypotheses in millimeters Enter for as needed Ho 1 Find the test statistic Round your answer to two decimal places Use technology to find the P value Round your answer to four decimal places P value E Pr 02 S 1033

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