Over the past several months, an adult patient has been treated for tetany. This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient’s total calcium tests gave the following readings. Assume that the population of x values has an approximately normal distribution. 9.9, 8.4, 10.5, 9.5, 9.4, 9.8, 10.0, 9.9, 11.2, 12.1
S=

Find a 99.9% confidence interval for the population mean of the total calcium in the patient’s blood.
Lower limit
Upper limit