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Obesity in adult males is associated with lower levels of sex hormone. A study investigated a possible link between obesity and plasma testosterone concentrations in adolescent males between the ages of 14 and 20 years. Plasma testosterone level is measured in nanomoles per liter of blood (nmol/1) for a sample of 25 obese adolescent males. The sample mean is 0.26 nmol/l, and the sample standard deviation is 0.11 nmol/l a) What distribution does the mean testosterone level in the sample of 25 follow? Specify. b) With a 95% level, estimate the mean testosterone level in obese adolescent males. We are 95% confident that the mean testosterone level in obese is between an nmol/l c) Perform hypothesis test on the claim that the mean testosterone level (H) in obese Adolescent males is greater than 0.24 nmol/l Define the Ho and Ha: Compute the test statistic: Compute/estimate the p-value: At a - 0.1, you should (reject/do not reject) Ho. d) Refer to c) if the alternative hypothesis Ha changes to μ what is the test statistic 0.24 and p value? e) Refer to c) if the alternative hypothesis Ha changes to μ what is the test statistic 0.24 and p value?

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