During the first 13 weeks of the television season, the Saturday evening 8:00 p. m. to9:00 p. m. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents18%. A sample of 300 homes two weeks after a Saturday night schedule revisionyielded the following viewing audience data: ABC 95 homes, CBS 70 homes, NBC89 homes, and independents 46 homes. Test with α=.05 to determine whether the viewingaudience proportions changed.

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?