2. Identify the appropriate sampling method with proper explanations for each of the following cases. (3)

• The names of all 1000 children are placed into a computer database. The computer is then instructed to randomly select 100 names. these children and their parents are then contacted.
• The names of all 1000 children are placed into a computer database and organized by grade (5th, 6th, 7th). The computer is then instructed to randomly select 35 names from each of the grades. these children and their parents are then contacted.
• A pregnancy study in Texas randomly selected 15 communities from the metropolitan area, then interviewed all pregnant women in these communities.