a sample of 150 individuals (males and females) was surveyed, and the individuals were asked to indicate their yearly incomes. The results of the survey are shown below.
income category male female
Category 1: $20,000 up to $40,000 10 30
Category 2: $40,000 up to $60,000 35 15
Category 3: $60,000 up to $80,000 15 45
Test at x=0/05 to determine if the yearly income is independent of the gender
detailed answers please