The link to article is : https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.157.5.737

7. Assume that the mean adjusted hippocampal volume for healthy adolescents is 9.01 cubic centimeters. State the hypotheses to test whether the AOAUD mean hippocampal volume is less than this value.

8.Compute the t-value and the P-value for this test.

9.In a complete sentence, state your official conclusion. Use the word "retain" or "reject."