Miller (2008) examined the energy drink consumption of college undergraduates and found that males use energy drinks significantly more often than females.

To further investigate this phenomenon, suppose that a researcher selects a random sample of n 5 36 male undergraduates and a sample of n 5 25 females. On average, the males reported consuming M 5 2.45 drinks per month and females had an average of M 5 1.28. Assume that the overall level of consumption for college undergraduates averages m 5 1.85 energy drinks per month, and that the distribution of monthly consumption scores is approximately normal with a standard deviation of s 5 1.2.

a. Does this sample of males support the conclusion that males consume significantly more energy drinks than the overall population average? Use a one-tailed test with a 5 .01.

b. Does the sample of females support the conclusion that females consume significantly fewer energy drinks than the overall population average? Again, use a one-tailed test with a 5 .01.