An ABC News poll asked adults whether they felt genetically
modified food was safe to eat. Thirty-five percent felt it was
safe, 52% felt it was not safe, and 13% had no opinion. A random
sample of 120 adults was asked the same question at a local county
fair. Forty people felt that genetically modified food was safe, 60
felt that it was not safe, and 20 had no opinion. At the 0.01 level
of significance, is there sufficient evidence...