Arterial blood gas analyses performed on a sample of 15 physically active adult males yielded the following resting PaO2 values: 75; 80; 80; 74; 84; 78; 89; 72; 83; 76; 75; 87; 78; 79; 88 a) Calculate the standard error b) Construct a 95 percent confidence interval for the mean of the population. c) Give a probabilistic interpretation for the confidence interval.