Do children diagnosed with attention deficit/hyperactivity disorder (ADHD) have smaller brains than children without this condition? Brain scans were completed for 152 children with ADHD and 139 children of similar age without ADHD. The mean brain size for the 152 children with ADHD was 1059.4 mL with a standard deviation of 117.5 mL. The mean brain size for the 139 children of with-out ADHD was 1104.5 mL with a standard deviation of 111.3 mL.
-What is the value of the statistic we should use in the 3S strategy?
A) 1059.4
B) 1104.5
C) -45.1
D) 6.2

Question

Quizplus · Accepted Answer

The statistic used in the 3S strategy is the difference in means between the two groups, which is 1104.5 mL - 1059.4 mL = 45.1 mL. Since the question asks for the value of the statistic, the correct choice is -45.1, indicating the difference in brain size between children with and without ADHD.

Do Children Diagnosed with Attention Deficit/hyperactivity Disorder (ADHD) Have Smaller