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

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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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