Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma. Over a period of months, an adult male has taken eight blood tests for uric acid. The mean concentration of the eight tests was 5.35 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with a standard deviation of 1.85 mg/dl. Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. First verify the CLT: 1) Assume the sample is random 2) The sample is large enough because 3) The population is large. On our calculator we use the following test, and the output is