Your job includes ordering phone service for new employees. You are considering two phone plans. The first plan charges $23.35 per month for one phone line. The second plan charges $14.99 per month for the first three months and then $29.99 per month after that for a phone line.

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?