i got strep and im down bad right now

(point) The EPA wants to test a randomly selected sample of water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the EPA wants a 80% confidence interval with a bound of error of 2 milligram per liter (mg/L), how many water specimens are required in the sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day have been approximately normally distributed with a standard deviation of 5.9 img/L) 62 (1 point A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 19 minutes. How large a sample should she take to estimate the mean time to within 3 minutes with 94% confidence? Sample Site 207