A 2013 article in the journal Adolescent Health stated that adding energy drinks to alcohol was associated with an elevated blood alcohol content compared to consuming alcohol without energy drinks in college students.
a. Suppose this conclusion was based on a significance test comparing means. Defining notation in context, identify the groups and the population means and state the null hypothesis for the test.
b. Suppose the study conclusion was based on a P-value of 0.01 obtained for the significance test mentioned in part a. Explain what you could learn from a confidence interval comparing the means that you are not able to learn from this P-value.