Question

33. In a study published in the American Journal of Psychiatry [157:737-744, May 2000], researchers wanted to measure the effect of alcohol on the development of the hippocampal region in adolescents. The hippocampus is the portion of the brain responsible for long-term memory storage. The researchers randomly selected 25 adolescents with adolescent-onset alcohol use disorders. They wanted to test the claim that the mean hippocampal volume in all alcoholic adolescents is less than the normal volume of 9.37〖cm〗^3. An analysis of the sample data revealed that the hippocampal volume is approximately Normal with no outliers, with mean of 8.2 and standard deviation of 0.712. Test the researchers’ claim at the α=.01 significance level. Show ALL STEPS including all calculations! (10 points)

Answer 1