Acid rain, caused by the reaction of certain air pollutants with rainwater, is a growing problem in the United States. Pure rain falling through clean air registers a pH value of 5.7 {pH is a measure of acidity: 0 is acid; 14 is alkaline). Suppose water samples from 60 rainfalls are analyzed for pH, and x and s are equal to 3.9 and 0.8, respectively. Find a 99% confidence interval For the mean pH in rainfall. (Round your answers to three decimal places.) |:|t