Question

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 researchers randomly selected 19 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm cubed. An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x overbarequals8.11 cm cubed and sequals0.8 cm cubed. Conduct the appropriate test at the alphaequals0.01 level of significance.

1. State the null and alternative hypotheses

2. identify the t-statistic

3. identify the p-value

Answer 1

1:

2:

3:

Conclusion: There is evidence to conclude that the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm cubed.