Are education and income related? To answer this question, a random sample of people was selected and each was asked to indicate into which of the following categories of education they belonged:

1. Less than high school

2. High school graduate

3. Some college or university but no degree

4. University degree

5. Postgraduate degree

Additionally, respondents were asked for their annual income group from the following choices:

1. Under $25,000

2. $25,000 up to but not including $40,000

3. $40,000 up to but not including $60,000

4. $60,000 up to $100,000

5. Greater than $100,000

Conduct a test to determine whether more education and higher incomes are linked.