During the first 13 weeks of the television season, the Saturday evening 8:00pm to 9:00pm audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and Independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following viewing audience data: ABC 95 homes, CBS 70 homes, NBC 89 homes, and Independents 46 homes. We are to determine whether the viewing audience proportions changed. The hypothesis is to be tested at 5% level of significance. The critical value from the table equals: