Final answer:
The relevant population refers to the average American household spending, with an annual consumption of $48,109, according to the Consumer Expenditure Survey which also covers spending on alcohol and coffee.
Step-by-step explanation:
The relevant population mentioned in the student's question refers to the average American citizens in terms of their consumption spending habits, particularly related to the amounts they spend on alcohol and coffee annually. This data is derived from the Consumer Expenditure Survey by the U.S. Bureau of Labor Statistics. The survey results from 2015 indicate that an average household spent $48,109 on consumption.
Housing and food were the highest expenses, each consuming about one-third of the budget. The remaining funds were spent on a variety of items including vehicle expenses, personal insurance, pensions, and a category that comprises alcohol, tobacco, reading, personal care, cash contributions, and miscellaneous expenses, which amounted to $3,356.