Question: A researcher wishes to determine whether total brain volume could be used as an indicator of obsessive compulsive disorder. Use the sample data below and a 0.01 significance level to test the claim that the obsessive compulsive group mean \(\mu \) 1 is larger than the control population mean \(\mu \) 2. Assume that the two populations are independent and have been randomly selected.

Obsessive Compulsive Group Control Group

n1=10 n2=10

xbar 1=1390.03 xbar 2=1268.41

s1=156.84 s2=137.97