Question

Researchers wanted to measure the effect of alcohol on the development of the hippocampal region in adolescents. the researchers randomly selected 12 adolescents with alcohol use disorders. they wanted to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm cube . an analysis of the sample data revealed that the hippocampal volume is approximately normal with x subbar =8.42 and s =0.7. conduct and appropriate test at the alpha =0.05 level of significance. what is the conclusion?

Answer 1

given data are:-

hypothesis:-

[ claim ]

the test statistic be:-

df = (n-1) = (12-1) = 11

the p value is :-

[ in any blank cell of excel type =T.DIST(-2.9692,11,TRUE) ]

conclusion:-

p value = 0.0064 < 0.05 (alpha)

we reject the null hypothesis. We conclude that the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm cube .

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