Suppose we have hypothesized that there is a relationship between sex (the independent variable) and the amount of money contributed to political campaigns (the dependent variable). And suppose that we measure these two variables for a sample of ten (fairly wealthy) people and receive the following results:

Sex Money contributed in thousands of dollars Male 10 Female 8 Female U Male 10 Female 10 Male 15 Male 20 Female 2 Female 5 Male 15