8.1 For the port-wine stains research study, answer the following: a. What are the populations of interest? b. What are some factors besides change in skin color that may be of interest to the investigators? 8.2 For the port-wine stains research study, do the following: a. Describe how the subjects in this experiment could have been selected so as to satisfy the randomization requirements. b. State several research hypotheses that may have been of interest to the researchers.