The mean annual consumption of beer per person in the United States is 4 = 22.0gallons. A random sample of 300 Washington, D.C. residents yielded a mean annual beerconsumption 7 = 21.2 gallons. At 5% significance level, do the data provide evidence toconclude that the mean annual consumption of beer per person for the national's capital islower than the national mean? Assume that the annual beer consumptions forWashington, D.C. residents has a standard deviation o = 5.5 gallons.
