The tennis team wants to purchase T-shirts for its members. Company A charges a $20 setup fee and $8 per shirt. Company B charges a $10 setup fee and $10 per shirt. Which company offers a better price for 12 shirts?

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?