only copy and paste necessary SAS code and output when you answer your question. No SAS log information is needed. Only homework in pdf version is accepted. 1. A study have a sample of 25 subjects. The age (years) of the subjects were, 62, 51, 68, 48, 51, 60, 51, 57, 57, 41, 62, 50, 53, 34, 62, 61, 52, 62, 47, 46, 35, 61, 68,47,54. a) What is the 95% confidence interval for the mean age? b) Can we conclude that the mean age of the population from which the sample was drawn is greater than 50 years? Please conduct a hypothesis test to answer this question. 2. One of the purposes of an investigation by Porcellini et al. was to investigate the effect of administration of intermittent interleukin (IL-2) on CD4 T cell count. The following table shows the CD4 T cell count at baseline and then again after 12 months with IL-2. Is there a significant change in CD4 T cell count (at alpha=0.05)? (Please use nonparametric method if needed). Subject 1 2 3 4 5 6 CD4 T cell count at entry (106/L) 173 58 103 181 105 90 CD4 T cell count at end