(20a,,).

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

20

adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of

9.02

cm3.

An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and

x=8.04

cm3

and

s=0.7

cm3.

Conduct the appropriate test at the

=0.01

level of significance.

Question content area bottom

Part 1

State the null and alternative hypotheses.

H0:

equals=

9.029.02

H1:

less than<

9.029.02

(Type integers or decimals. Do not round.)

Part 2

Identify the t-statistic.

t0=enter your response here

(Round to two decimal places as needed.)