Three groups of senior citizens with the different education levels are surveyed to find whether or not they're confused by new medicare drug benefit plan. Using following data, test the hypothesis that there is no significant defference in proportion of seniors confused among the three groups regardless of education level.
Employ 5 % significance level.
Education Level

College +

High School

Less than High School

Total

Number Confused

60

120

160

340

Number Not Confused

90

130

40

260

Total

150

250

200

600
