An article in the asce journal of energy engineering ("overview of reservoir release improvements at 20 tva dams," vol. 125, april 1999, pp. 1-17) presents data on dissolved oxygen concentration from streams below 20 dams in the tennessee valley authority system. the sample mean from the observations is and the sample standard deviation is assume population is approximately normally distributed. round your answers to 2 decimal places. (a) calculate the 95% two-sided confidence interval on the mean oxygen concentration. (b) calculate the 95% two-sided prediction interval on the dissolved oxygen concentration for the next stream that will be tested. (c) find an interval that will contain 95% of the values of the dissolved oxygen concentration with 99% confidence.