An Economist Conducted a Study of the Possible Association Between

Multiple Choice

An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. Of particular interest was whether higher income would result in shoppers to spending more on groceries. A random sample of shoppers at a local supermarket was obtained. A questionnaire was administered asking about the weekly income of each shopper's family and their grocery bill for that week. The explanatory variable is:

A) weekly income.
B) weekly expenditure.
C) gender
D) All of the answer options are correct.