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(Steps Shown) Are severe psychiatric disorders related to biological factors that can be physically observed? One study used x-ray computed tomography (CT) to

Question: Are severe psychiatric disorders related to biological factors that can be physically observed? One study used x-ray computed tomography (CT) to collect data on brain volumes for a group of patients with obsessive-compulsive disorders and a control group of healthy patients. Sample results for volumes (in mL) follow for the right cordate. Construct a 99% confidence interval estimate of the difference between the mean brain volume for the healthy control group and the mean brain colume for the obsessive control group. What does the confidence interval suggest about the difference between the two population means?

Group Sample Size Mean SD
Control Group \[n=10\] \[\bar{x}=0.45\] \[s=0.08\]
Obssessive-compulsive patients \[n=10\] \[\bar{x}=0.34\] \[s=0.08\]

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