In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the portion of the brain responsible for long-term memory storage, in adolescents. The reason randomly selected 11 adolescents with alcohol use disorders to determine wether the hippocampal volumes in the alcoholic adolescents were less

than the normal volume of 9.02cm3. An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x=8.13 cm3 and s=0.7 cm3 conduct the appropriate test at the a=0.01 level of significance.