The American Journal of Human Biology reported on a study of a dietary assessment tool for use in the population of urban Native American youth. The subjects were Native American youth attending an after-school program in Minneapolis, MN. All 61 children between the ages of 9 and 13 who satisfied the requirements of the study objectives were included in the experiment.
a. Describe the sampling plan used to select study participants.
b. What chance mechanism was used to select this sample of 61 Native American 9- to 13-year-old individuals?
c. If you had to devise an alternative sampling plan, what would you change?