Do children diagnosed with attention deficit / hyperactivity disorder (ADHD) hav
ID: 3366624 • Letter: D
Question
Do children diagnosed with attention deficit / hyperactivity disorder (ADHD) have smaller brains than children without this condition? Researchers investigated this question by taking brain scans for 152 children diagnosed with ADHD and 139 children of similar age without ADHD. Summary information for total cerebral volume (in millimeters) is given below:
If a hypothesis test was performed to answer the question of interest, which of the following is the most appropriate to use?
n x? s Children with ADHD 152 1059.4 117.5 Children without ADHD 139 1104.5 111.3Explanation / Answer
as sample data for both of the groups are independent therefore appropriate test should be two-sample t-test
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