13.11 The characteristics of low birth weight children dying of sudden infant death syndrome were examined for both females and males. The ages at time of death for samples of 11 girls and 16 boys are shown below

1. Test the null hypothesis that the median ages at death are identical for the two populations. Use a Wilcoxon rank sum test. What do you conclude?
2. Test the null hypothesis that the mean ages at death are identical for the two populations. Use a t-test. What do you conclude?
3. Are both of the two tests in parts (a) and (b) appropriate? Why or why not? Which one would you present?

Age (days) Females Males 53 46 115 56 52 133 60 58 134 60 59 167 78 77 175 87 78 102 80 117 81 134 84 160 103 277 114