Brittany is developing a sampling plan for a study of Healthy Food consumption among the students…

Brittany is developing a sampling plan for a study of Healthy Food consumption among the students at Metro University. She wants to ensure that students from different age groups are represented. She also believes that food consumption habit of girls is equally important though numbers of girls are far less than the boys in the university. Finally, she also wants to know doctors’ opinion regarding benefits of Healthy Food consumption; however, Doctors are hard to reach group. Brittany encountered a problem that no sampling frame of students or Doctors are available. What type(s) of sampling method should Brittany use for the –