A lab in Alaska is interested in finding the mean chloride level for a healthy resident. A sample of 90 residents have a mean chloride level of 103. It is known that the chloride level in Alaska has a standard deviation of 35. Find the 99% confidence interval for the true mean chloride level of all healthy Alaskan residents.
What is the lower limit of the 99% confidence interval?
What is the upper limit of the 99% confidence interval?